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Khasanov R, Ruan BB, Shi YQ, Chen GF, Luetkens H, Ren ZA, Guguchia Z. Tuning of the flat band and its impact on superconductivity in Mo 5Si 3-xP x. Nat Commun 2024; 15:2197. [PMID: 38467628 PMCID: PMC10928102 DOI: 10.1038/s41467-024-46514-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Accepted: 02/15/2024] [Indexed: 03/13/2024] Open
Abstract
The superconductivity in systems containing dispersionless (flat) bands is seemingly paradoxical, as traditional Bardeen-Cooper-Schrieffer theory requires an infinite enhancement of the carrier masses. However, the combination of flat and steep (dispersive) bands within the multiple band scenario might boost superconducting responses, potentially explaining high-temperature superconductivity in cuprates and metal hydrides. Here, we report on the magnetic penetration depths, the upper critical field, and the specific heat measurements, together with the first-principles calculations for the Mo5Si3-xPx superconducting family. The band structure features a flat band that gradually approaches the Fermi level as a function of phosphorus doping x, reaching the Fermi level at x ≃ 1.3. This leads to an abrupt change in nearly all superconducting quantities. The superfluid density data placed on the 'Uemura plot' results in two separated branches, thus indicating that the emergence of a flat band enhances correlations between conducting electrons.
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Affiliation(s)
- Rustem Khasanov
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232, Villigen PSI, Switzerland.
| | - Bin-Bin Ruan
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, 100190, Beijing, China.
| | - Yun-Qing Shi
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, 100190, Beijing, China
- School of Physical Sciences, University of Chinese Academy of Sciences, 100049, Beijing, China
| | - Gen-Fu Chen
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, 100190, Beijing, China
- School of Physical Sciences, University of Chinese Academy of Sciences, 100049, Beijing, China
| | - Hubertus Luetkens
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232, Villigen PSI, Switzerland
| | - Zhi-An Ren
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, 100190, Beijing, China
- School of Physical Sciences, University of Chinese Academy of Sciences, 100049, Beijing, China
| | - Zurab Guguchia
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232, Villigen PSI, Switzerland
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2
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Huangfu S, Austin AC, Guguchia Z, Fjellvåg ØS, Knorpp AJ, Luetkens H, Schilling A, Stuer M. Tuneable Short-Range Antiferromagnetic Correlation in Fe-Containing Entropy Stabilized Oxides. Inorg Chem 2024; 63:247-255. [PMID: 38101323 DOI: 10.1021/acs.inorgchem.3c03028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2023]
Abstract
To elucidate the impact of a high entropy elemental distribution of the lattice site on the magnetic properties in oxide compounds, a series of complex perovskites BaBO3 (B = Y, Fe, Ti, Zr, Hf, Nb, and Ta) with different Fe content ratios (0, 0.2, 0.3, and 0.4) have been synthesized and thoroughly characterized. In this complex oxide series, superconducting quantum interference device magnetometry reveals a gradual change of a well-defined magnetic phase transition and B-site magnetic moment, which correlates with the Fe content. More importantly, a comprehensive analysis of the sample with a 0.4-Fe content (40% on the B-site) including magnetization, heat capacity, neutron diffraction, and muon-spin rotation measurements suggests that in the low-temperature state, a short-range antiferromagnetic correlation may exist, which could result from the magnetic interaction of Fe ions and consequent redistribution of associated d-electrons.
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Affiliation(s)
- Shangxiong Huangfu
- Laboratory for High Performance Ceramics, Empa, Überlandstrasse 129, Dübendorf CH-8600, Switzerland
| | - Alexandra C Austin
- Laboratory for High Performance Ceramics, Empa, Überlandstrasse 129, Dübendorf CH-8600, Switzerland
- Centre for Advanced Structural Ceramics, Department of Materials, Imperial College London, London SW7 2AZ, United Kingdom
| | - Zurab Guguchia
- Laboratory for Muon Spin Spectroscopy (LMU), Paul Scherrer Institute (PSI), Forschungsstrasse 111, Villigen CH-5232, Switzerland
| | - Øystein S Fjellvåg
- Laboratory for Neutron Scattering and Imaging (LNS), Paul Scherrer Institute (PSI), Forschungsstrasse 111, Villigen CH-5232, Switzerland
- Department for Hydrogen Technology, Institute for Energy Technology, Kjeller NO-2027, Norway
| | - Amy J Knorpp
- Laboratory for High Performance Ceramics, Empa, Überlandstrasse 129, Dübendorf CH-8600, Switzerland
| | - Hubertus Luetkens
- Laboratory for Muon Spin Spectroscopy (LMU), Paul Scherrer Institute (PSI), Forschungsstrasse 111, Villigen CH-5232, Switzerland
| | - Andreas Schilling
- Department of Physics, University of Zurich, Winterthurerstrasse 190, Zurich CH-8057, Switzerland
| | - Michael Stuer
- Laboratory for High Performance Ceramics, Empa, Überlandstrasse 129, Dübendorf CH-8600, Switzerland
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3
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Guguchia Z, Das D, Simutis G, Adachi T, Küspert J, Kitajima N, Elender M, Grinenko V, Ivashko O, Zimmermann MV, Müller M, Mielke C, Hotz F, Mudry C, Baines C, Bartkowiak M, Shiroka T, Koike Y, Amato A, Hicks CW, Gu GD, Tranquada JM, Klauss HH, Chang JJ, Janoschek M, Luetkens H. Designing the stripe-ordered cuprate phase diagram through uniaxial-stress. Proc Natl Acad Sci U S A 2024; 121:e2303423120. [PMID: 38150501 PMCID: PMC10769840 DOI: 10.1073/pnas.2303423120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Accepted: 11/02/2023] [Indexed: 12/29/2023] Open
Abstract
The ability to efficiently control charge and spin in the cuprate high-temperature superconductors is crucial for fundamental research and underpins technological development. Here, we explore the tunability of magnetism, superconductivity, and crystal structure in the stripe phase of the cuprate La[Formula: see text]Ba[Formula: see text]CuO[Formula: see text], with [Formula: see text] = 0.115 and 0.135, by employing temperature-dependent (down to 400 mK) muon-spin rotation and AC susceptibility, as well as X-ray scattering experiments under compressive uniaxial stress in the CuO[Formula: see text] plane. A sixfold increase of the three-dimensional (3D) superconducting critical temperature [Formula: see text] and a full recovery of the 3D phase coherence is observed in both samples with the application of extremely low uniaxial stress of [Formula: see text]0.1 GPa. This finding demonstrates the removal of the well-known 1/8-anomaly of cuprates by uniaxial stress. On the other hand, the spin-stripe order temperature as well as the magnetic fraction at 400 mK show only a modest decrease under stress. Moreover, the onset temperatures of 3D superconductivity and spin-stripe order are very similar in the large stress regime. However, strain produces an inhomogeneous suppression of the spin-stripe order at elevated temperatures. Namely, a substantial decrease of the magnetic volume fraction and a full suppression of the low-temperature tetragonal structure is found under stress, which is a necessary condition for the development of the 3D superconducting phase with optimal [Formula: see text]. Our results evidence a remarkable cooperation between the long-range static spin-stripe order and the underlying crystalline order with the three-dimensional fully coherent superconductivity. Overall, these results suggest that the stripe- and the SC order may have a common physical mechanism.
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Affiliation(s)
- Z. Guguchia
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232Villigen, Switzerland
| | - D. Das
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232Villigen, Switzerland
| | - G. Simutis
- Laboratory for Neutron and Muon Instrumentation, Paul Scherrer Institut, CH-5232Villigen, Switzerland
| | - T. Adachi
- Department of Engineering and Applied Sciences, Sophia University, Tokyo102-8554, Japan
| | - J. Küspert
- Physik-Institut, Universität Zürich, CH-8057Zürich, Switzerland
| | - N. Kitajima
- Department of Applied Physics, Tohoku University, Sendai980-8579, Japan
| | - M. Elender
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232Villigen, Switzerland
| | - V. Grinenko
- Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Pudong, 201210Shanghai, China
| | - O. Ivashko
- Deutsches Elektronen-Synchrotron, 22607Hamburg, Germany
| | | | - M. Müller
- Condensed Matter Theory Group, Paul Scherrer Institute, CH-5232Villigen, Switzerland
| | - C. Mielke
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232Villigen, Switzerland
| | - F. Hotz
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232Villigen, Switzerland
| | - C. Mudry
- Condensed Matter Theory Group, Paul Scherrer Institute, CH-5232Villigen, Switzerland
- Institut de Physique, École Polytechnique Fédérale de Lausanne, LausanneCH-1015, Switzerland
| | - C. Baines
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232Villigen, Switzerland
| | - M. Bartkowiak
- Laboratory for Neutron and Muon Instrumentation, Paul Scherrer Institut, CH-5232Villigen, Switzerland
| | - T. Shiroka
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232Villigen, Switzerland
- Laboratorium für Festkörperphysik, ETH Zürich, CH-8093Zürich, Switzerland
| | - Y. Koike
- Department of Applied Physics, Tohoku University, Sendai980-8579, Japan
| | - A. Amato
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232Villigen, Switzerland
| | - C. W. Hicks
- Max Planck Institute for Chemical Physics of Solids, D-01187Dresden, Germany
- School of Physics and Astronomy, University of Birmingham, BirminghamB15 2TT, United Kingdom
| | - G. D. Gu
- Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory, Upton, NY11973
| | - J. M. Tranquada
- Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory, Upton, NY11973
| | - H.-H. Klauss
- Institute for Solid State and Materials Physics, Technische Universitat Dresden, D-01069Dresden, Germany
| | - J. J. Chang
- Physik-Institut, Universität Zürich, CH-8057Zürich, Switzerland
| | - M. Janoschek
- Laboratory for Neutron and Muon Instrumentation, Paul Scherrer Institut, CH-5232Villigen, Switzerland
- Physik-Institut, Universität Zürich, CH-8057Zürich, Switzerland
| | - H. Luetkens
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232Villigen, Switzerland
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4
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Khasanov R, Ramires A, Grinenko V, Shipulin I, Kikugawa N, Sokolov DA, Krieger JA, Hicken TJ, Maeno Y, Luetkens H, Guguchia Z. In-Plane Magnetic Penetration Depth in Sr_{2}RuO_{4}: Muon-Spin Rotation and Relaxation Study. Phys Rev Lett 2023; 131:236001. [PMID: 38134793 DOI: 10.1103/physrevlett.131.236001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Revised: 10/02/2023] [Accepted: 10/03/2023] [Indexed: 12/24/2023]
Abstract
We report on measurements of the in-plane magnetic penetration depth (λ_{ab}) in single crystals of Sr_{2}RuO_{4} down to ≃0.015 K by means of muon-spin rotation-relaxation. The linear temperature dependence of λ_{ab}^{-2} for T≲0.7 K suggests the presence of nodes in the superconducting gap. This statement is further substantiated by observation of the Volovik effect, i.e., the reduction of λ_{ab}^{-2} as a function of the applied magnetic field. The experimental zero-field and zero-temperature value of λ_{ab}=124(3) nm agrees with λ_{ab}≃130 nm, calculated based on results of electronic structure measurements reported in A. Tamai et al. [High-resolution photoemission on Sr_{2}RuO_{4} reveals correlation-enhanced effective spin-orbit coupling and dominantly local self-energies, Phys. Rev. X 9, 021048 (2019)PRXHAE2160-330810.1103/PhysRevX.9.021048]. Our analysis reveals that a simple nodal superconducting energy gap, described by the lowest possible harmonic of a gap function, does not capture the dependence of λ_{ab}^{-2} on T, so the higher angular harmonics of the energy gap function need to be introduced.
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Affiliation(s)
- Rustem Khasanov
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - Aline Ramires
- Laboratory for Theoretical and Computational Physics, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - Vadim Grinenko
- Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai 201210, China
- School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Ilya Shipulin
- Leibniz Institute for Solid State and Materials Research, 01069 Dresden, Germany
| | - Naoki Kikugawa
- National Institute for Materials Science, Tsukuba, Ibaraki 305-0003, Japan
| | - Dmitry A Sokolov
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, 01187 Dresden, Germany
| | - Jonas A Krieger
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - Thomas J Hicken
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - Yoshiteru Maeno
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
- Toyota Riken - Kyoto University Research Center (TRiKUC), Kyoto 606-8501, Japan
| | - Hubertus Luetkens
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - Zurab Guguchia
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
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5
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Guguchia Z, Gawryluk DJ, Shin S, Hao Z, Mielke Iii C, Das D, Plokhikh I, Liborio L, Shenton JK, Hu Y, Sazgari V, Medarde M, Deng H, Cai Y, Chen C, Jiang Y, Amato A, Shi M, Hasan MZ, Yin JX, Khasanov R, Pomjakushina E, Luetkens H. Hidden magnetism uncovered in a charge ordered bilayer kagome material ScV 6Sn 6. Nat Commun 2023; 14:7796. [PMID: 38016982 PMCID: PMC10684576 DOI: 10.1038/s41467-023-43503-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Accepted: 11/10/2023] [Indexed: 11/30/2023] Open
Abstract
Charge ordered kagome lattices have been demonstrated to be intriguing platforms for studying the intertwining of topology, correlation, and magnetism. The recently discovered charge ordered kagome material ScV6Sn6 does not feature a magnetic groundstate or excitations, thus it is often regarded as a conventional paramagnet. Here, using advanced muon-spin rotation spectroscopy, we uncover an unexpected hidden magnetism of the charge order. We observe an enhancement of the internal field width sensed by the muon ensemble, which takes place within the charge ordered state. More importantly, the muon spin relaxation rate below the charge ordering temperature is substantially enhanced by applying an external magnetic field. Taken together with the hidden magnetism found in AV3Sb5 (A = K, Rb, Cs) and FeGe kagome systems, our results suggest ubiqitous time-reversal symmetry-breaking in charge ordered kagome lattices.
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Affiliation(s)
- Z Guguchia
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232, Villigen PSI, Switzerland.
| | - D J Gawryluk
- Laboratory for Multiscale Materials Experiments, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland.
| | - S Shin
- Laboratory for Multiscale Materials Experiments, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland
| | - Z Hao
- Department of Physics, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, China
| | - C Mielke Iii
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232, Villigen PSI, Switzerland
- Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057, Zürich, Switzerland
| | - D Das
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232, Villigen PSI, Switzerland
| | - I Plokhikh
- Laboratory for Multiscale Materials Experiments, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland
| | - L Liborio
- Scientific Computing Department, Science & Technology Facilities Council, Rutherford Appleton Laboratory, Didcot, OX11 0QX, UK
| | - J Kane Shenton
- Scientific Computing Department, Science & Technology Facilities Council, Rutherford Appleton Laboratory, Didcot, OX11 0QX, UK
| | - Y Hu
- Photon Science Division, Paul Scherrer Institut, CH-5232, Villigen PSI, Switzerland
| | - V Sazgari
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232, Villigen PSI, Switzerland
| | - M Medarde
- Laboratory for Multiscale Materials Experiments, Paul Scherrer Institut, CH-5232, Villigen PSI, Switzerland
| | - H Deng
- Department of Physics, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, China
| | - Y Cai
- Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China
| | - C Chen
- Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Y Jiang
- Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7), Department of Physics, Princeton University, Princeton, NJ, 08544, USA
| | - A Amato
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232, Villigen PSI, Switzerland
| | - M Shi
- Photon Science Division, Paul Scherrer Institut, CH-5232, Villigen PSI, Switzerland
| | - M Z Hasan
- Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7), Department of Physics, Princeton University, Princeton, NJ, 08544, USA
- Princeton Institute for the Science and Technology of Materials, Princeton University, Princeton, NJ, 08540, USA
- Quantum Science Center, Oak Ridge, TN, 37831, USA
| | - J-X Yin
- Department of Physics, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, China
| | - R Khasanov
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232, Villigen PSI, Switzerland
| | - E Pomjakushina
- Laboratory for Multiscale Materials Experiments, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland
| | - H Luetkens
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232, Villigen PSI, Switzerland
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6
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Lee S, Choi YS, Do SH, Lee W, Lee CH, Lee M, Vojta M, Wang CN, Luetkens H, Guguchia Z, Choi KY. Kondo screening in a Majorana metal. Nat Commun 2023; 14:7405. [PMID: 37974022 PMCID: PMC10654600 DOI: 10.1038/s41467-023-43185-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Accepted: 11/02/2023] [Indexed: 11/19/2023] Open
Abstract
Kondo impurities provide a nontrivial probe to unravel the character of the excitations of a quantum spin liquid. In the S = 1/2 Kitaev model on the honeycomb lattice, Kondo impurities embedded in the spin-liquid host can be screened by itinerant Majorana fermions via gauge-flux binding. Here, we report experimental signatures of metallic-like Kondo screening at intermediate temperatures in the Kitaev honeycomb material α-RuCl3 with dilute Cr3+ (S = 3/2) impurities. The static magnetic susceptibility, the muon Knight shift, and the muon spin-relaxation rate all feature logarithmic divergences, a hallmark of a metallic Kondo effect. Concurrently, the linear coefficient of the magnetic specific heat is large in the same temperature regime, indicating the presence of a host Majorana metal. This observation opens new avenues for exploring uncharted Kondo physics in insulating quantum magnets.
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Affiliation(s)
- S Lee
- Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science, Pohang, 37673, Republic of Korea
| | - Y S Choi
- Department of Physics, Sungkyunkwan University, Suwon, 16419, Republic of Korea
| | - S-H Do
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, USA
| | - W Lee
- Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science, Pohang, 37673, Republic of Korea
- Rare Isotope Science Project, Institute for Basic Science, Daejeon, 34000, Republic of Korea
| | - C H Lee
- Department of Physics, Chung-Ang University, 84 Heukseok-ro, Seoul, 06974, Republic of Korea
| | - M Lee
- National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico, 87545, USA
| | - M Vojta
- Institut für Theoretische Physik, Technische Universität Dresden, 01062, Dresden, Germany
| | - C N Wang
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Villigen PSI, 5232, Switzerland
| | - H Luetkens
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Villigen PSI, 5232, Switzerland
| | - Z Guguchia
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Villigen PSI, 5232, Switzerland
| | - K-Y Choi
- Department of Physics, Sungkyunkwan University, Suwon, 16419, Republic of Korea.
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7
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Flokstra M, Stewart R, Yim CM, Trainer C, Wahl P, Miller D, Satchell N, Burnell G, Luetkens H, Prokscha T, Suter A, Morenzoni E, Bobkova IV, Bobkov AM, Lee S. Spin-orbit driven superconducting proximity effects in Pt/Nb thin films. Nat Commun 2023; 14:5081. [PMID: 37604804 PMCID: PMC10442328 DOI: 10.1038/s41467-023-40757-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Accepted: 08/07/2023] [Indexed: 08/23/2023] Open
Abstract
Manipulating the spin state of thin layers of superconducting material is a promising route to generate dissipationless spin currents in spintronic devices. Approaches typically focus on using thin ferromagnetic elements to perturb the spin state of the superconducting condensate to create spin-triplet correlations. We have investigated simple structures that generate spin-triplet correlations without using ferromagnetic elements. Scanning tunneling spectroscopy and muon-spin rotation are used to probe the local electronic and magnetic properties of our hybrid structures, demonstrating a paramagnetic contribution to the magnetization that partially cancels the Meissner screening. This spin-orbit generated magnetization is shown to derive from the spin of the equal-spin pairs rather than from their orbital motion and is an important development in the field of superconducting spintronics.
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Affiliation(s)
- Machiel Flokstra
- School of Physics and Astronomy, SUPA, University of St. Andrews, St. Andrews, UK
| | - Rhea Stewart
- School of Physics and Astronomy, SUPA, University of St. Andrews, St. Andrews, UK
- ISIS Neutron and Muon Facility, Rutherford Appleton Laboratory, Science and Technology Facilities Council, Didcot, UK
| | - Chi-Ming Yim
- School of Physics and Astronomy, SUPA, University of St. Andrews, St. Andrews, UK
- Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai, China
| | - Christopher Trainer
- School of Physics and Astronomy, SUPA, University of St. Andrews, St. Andrews, UK
| | - Peter Wahl
- School of Physics and Astronomy, SUPA, University of St. Andrews, St. Andrews, UK
| | - David Miller
- School of Chemistry, University of St. Andrews, St. Andrews, UK
| | - Nathan Satchell
- School of Physics and Astronomy, University of Leeds, Leeds, UK
| | - Gavin Burnell
- School of Physics and Astronomy, University of Leeds, Leeds, UK
| | - Hubertus Luetkens
- Labor für Myonspinspektroskopie, Paul Scherrer Institut, Villigen PSI, Switzerland
| | - Thomas Prokscha
- Labor für Myonspinspektroskopie, Paul Scherrer Institut, Villigen PSI, Switzerland
| | - Andreas Suter
- Labor für Myonspinspektroskopie, Paul Scherrer Institut, Villigen PSI, Switzerland
| | - Elvezio Morenzoni
- Labor für Myonspinspektroskopie, Paul Scherrer Institut, Villigen PSI, Switzerland
| | - Irina V Bobkova
- Institute of Solid State Physics, Chernogolovka, Russia
- Moscow Institute of Physics and Technology, Dolgoprudny, Russia
- National Research University Higher School of Economics, Moscow, Russia
| | | | - Stephen Lee
- School of Physics and Astronomy, SUPA, University of St. Andrews, St. Andrews, UK.
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8
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Zhong Y, Liu J, Wu X, Guguchia Z, Yin JX, Mine A, Li Y, Najafzadeh S, Das D, Mielke C, Khasanov R, Luetkens H, Suzuki T, Liu K, Han X, Kondo T, Hu J, Shin S, Wang Z, Shi X, Yao Y, Okazaki K. Nodeless electron pairing in CsV 3Sb 5-derived kagome superconductors. Nature 2023; 617:488-492. [PMID: 37100906 DOI: 10.1038/s41586-023-05907-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Accepted: 03/01/2023] [Indexed: 04/28/2023]
Abstract
The newly discovered kagome superconductors represent a promising platform for investigating the interplay between band topology, electronic order and lattice geometry1-9. Despite extensive research efforts on this system, the nature of the superconducting ground state remains elusive10-17. In particular, consensus on the electron pairing symmetry has not been achieved so far18-20, in part owing to the lack of a momentum-resolved measurement of the superconducting gap structure. Here we report the direct observation of a nodeless, nearly isotropic and orbital-independent superconducting gap in the momentum space of two exemplary CsV3Sb5-derived kagome superconductors-Cs(V0.93Nb0.07)3Sb5 and Cs(V0.86Ta0.14)3Sb5-using ultrahigh-resolution and low-temperature angle-resolved photoemission spectroscopy. Remarkably, such a gap structure is robust to the appearance or absence of charge order in the normal state, tuned by isovalent Nb/Ta substitutions of V. Our comprehensive characterizations of the superconducting gap provide indispensable information on the electron pairing symmetry of kagome superconductors, and advance our understanding of the superconductivity and intertwined electronic orders in quantum materials.
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Affiliation(s)
- Yigui Zhong
- Institute for Solid States Physics, The University of Tokyo, Kashiwa, Japan
| | - Jinjin Liu
- Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing, China
- Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, Beijing Institute of Technology, Beijing, China
| | - Xianxin Wu
- CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing, China
| | - Zurab Guguchia
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Villigen PSI, Switzerland
| | - J-X Yin
- Laboratory for Quantum Emergence, Department of Physics, Southern University of Science and Technology, Shenzhen, China
- Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area (Guangdong), Shenzhen, China
| | - Akifumi Mine
- Institute for Solid States Physics, The University of Tokyo, Kashiwa, Japan
| | - Yongkai Li
- Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing, China
- Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, Beijing Institute of Technology, Beijing, China
- Material Science Center, Yangtze Delta Region Academy of Beijing Institute of Technology, Jiaxing, China
| | - Sahand Najafzadeh
- Institute for Solid States Physics, The University of Tokyo, Kashiwa, Japan
| | - Debarchan Das
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Villigen PSI, Switzerland
| | - Charles Mielke
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Villigen PSI, Switzerland
| | - Rustem Khasanov
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Villigen PSI, Switzerland
| | - Hubertus Luetkens
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Villigen PSI, Switzerland
| | - Takeshi Suzuki
- Institute for Solid States Physics, The University of Tokyo, Kashiwa, Japan
| | - Kecheng Liu
- Institute for Solid States Physics, The University of Tokyo, Kashiwa, Japan
| | - Xinloong Han
- Kavli Institute of Theoretical Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Takeshi Kondo
- Institute for Solid States Physics, The University of Tokyo, Kashiwa, Japan
- Trans-scale Quantum Science Institute, The University of Tokyo, Tokyo, Japan
| | - Jiangping Hu
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, China
| | - Shik Shin
- Institute for Solid States Physics, The University of Tokyo, Kashiwa, Japan
- Office of University Professor, The University of Tokyo, Kashiwa, Japan
| | - Zhiwei Wang
- Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing, China.
- Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, Beijing Institute of Technology, Beijing, China.
- Material Science Center, Yangtze Delta Region Academy of Beijing Institute of Technology, Jiaxing, China.
| | - Xun Shi
- Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing, China.
- Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, Beijing Institute of Technology, Beijing, China.
| | - Yugui Yao
- Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing, China
- Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, Beijing Institute of Technology, Beijing, China
- Material Science Center, Yangtze Delta Region Academy of Beijing Institute of Technology, Jiaxing, China
| | - Kozo Okazaki
- Institute for Solid States Physics, The University of Tokyo, Kashiwa, Japan.
- Trans-scale Quantum Science Institute, The University of Tokyo, Tokyo, Japan.
- Material Innovation Research Center, The University of Tokyo, Kashiwa, Japan.
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9
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Pughe C, Mustonen OHJ, Gibbs AS, Lee S, Stewart R, Gade B, Wang C, Luetkens H, Foster A, Coomer FC, Takagi H, Cussen EJ. Partitioning the Two-Leg Spin Ladder in Ba 2Cu 1 - x Zn x TeO 6: From Magnetic Order through Spin-Freezing to Paramagnetism. Chem Mater 2023; 35:2752-2761. [PMID: 37063596 PMCID: PMC10100530 DOI: 10.1021/acs.chemmater.2c02939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Revised: 03/06/2023] [Indexed: 06/19/2023]
Abstract
Ba2CuTeO6 has attracted significant attention as it contains a two-leg spin ladder of Cu2+ cations that lies in close proximity to a quantum critical point. Recently, Ba2CuTeO6 has been shown to accommodate chemical substitutions, which can significantly tune its magnetic behavior. Here, we investigate the effects of substitution for non-magnetic Zn2+ impurities at the Cu2+ site, partitioning the spin ladders. Results from bulk thermodynamic and local muon magnetic characterization on the Ba2Cu1 - x Zn x TeO6 solid solution (0 ≤ x ≤ 0.6) indicate that Zn2+ partitions the Cu2+ spin ladders into clusters and can be considered using the percolation theory. As the average cluster size decreases with increasing Zn2+ substitution, there is an evolving transition from long-range order to spin-freezing as the critical cluster size is reached between x = 0.1 to x = 0.2, beyond which the behavior became paramagnetic. This demonstrates well-controlled tuning of the magnetic disorder, which is highly topical across a range of low-dimensional Cu2+-based materials. However, in many of these cases, the chemical disorder is also relatively strong in contrast to Ba2CuTeO6 and its derivatives. Therefore, Ba2Cu1 - x Zn x TeO6 provides an ideal model system for isolating the effect of defects and segmentation in low-dimensional quantum magnets.
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Affiliation(s)
- Charlotte Pughe
- Department
of Material Science and Engineering, University
of Sheffield, Sheffield S1 3JD, United
Kingdom
| | - Otto H. J. Mustonen
- Department
of Material Science and Engineering, University
of Sheffield, Sheffield S1 3JD, United
Kingdom
- School
of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, United
Kingdom
| | - Alexandra S. Gibbs
- School
of Chemistry, University of St Andrews, St Andrews KY16 9ST , United Kingdom
- ISIS
Pulsed Neutron and Muon Source, STFC Rutherford
Appleton Laboratory, Didcot OX11 0QX, United
Kingdom
- Max
Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart, Germany
| | - Stephen Lee
- School of
Physics and Astronomy, St Andrews KY16 9SS, United
Kingdom
| | - Rhea Stewart
- School of
Physics and Astronomy, St Andrews KY16 9SS, United
Kingdom
| | - Ben Gade
- School
of Chemistry, University of St Andrews, St Andrews KY16 9ST , United Kingdom
| | - Chennan Wang
- Paul
Scherrer Institute, Forschungsstrasse 111, 5232 Villigen PSI, Switzerland
| | - Hubertus Luetkens
- Paul
Scherrer Institute, Forschungsstrasse 111, 5232 Villigen PSI, Switzerland
| | - Anna Foster
- Department
of Chemistry, University of Sheffield, Sheffield S3 7HF, United Kingdom
| | - Fiona C. Coomer
- Echion
Technologies, Sawston, Cambridge CB22 3FG, United
Kingdom
| | - Hidenori Takagi
- Max
Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart, Germany
- Department
of Physics, University of Tokyo, Tokyo 113-0013, Japan
- Institute
for Functional Matter and Quantum Technologies, University of Stuttgart, 70569 Stuttgart, Germany
| | - Edmund J. Cussen
- Department
of Material Science and Engineering, University
of Sheffield, Sheffield S1 3JD, United
Kingdom
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10
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Biswas S, Megatli-Niebel I, Raselli L, Simke R, Cocolios TE, Deokar N, Elender M, Gerchow L, Hess H, Khasanov R, Knecht A, Luetkens H, Ninomiya K, Papa A, Prokscha T, Reiter P, Sato A, Severijns N, Shiroka T, Seidlitz M, Vogiatzi SM, Wang C, Wauters F, Warr N, Amato A. The non-destructive investigation of a late antique knob bow fibula (Bügelknopffibel) from Kaiseraugst/CH using Muon Induced X-ray Emission (MIXE). Herit Sci 2023; 11:43. [PMID: 36873814 PMCID: PMC9977900 DOI: 10.1186/s40494-023-00880-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Accepted: 02/10/2023] [Indexed: 06/18/2023]
Abstract
A knob bow fibula (Bügelknopffibel) of the Leutkirch type, which typologically belongs to the second half of the 4th and early 5th century CE, was excavated in 2018 in the Roman city of Augusta Raurica, present-day Kaiseraugst (AG, Switzerland). This was analyzed for the first time for its elemental composition by using the non-destructive technique of Muon Induced X-ray Emission (MIXE) in the continuous muon beam facility at the Paul Scherrer Institute (PSI). In the present work, the detection limit is 0.4 wt% with ∼ 1.5 hours of measurement time. The fibula was measured at six different positions, at a depth of 0.3-0.4 mm inside the material. The experimental results show that the fibula is made of bronze, containing the main elements copper (Cu), zinc (Zn), tin (Sn) and lead (Pb). The compositional similarities/differences between different parts of the fibula reveal that it was manufactured as two "workpieces". One workpiece consists of the knob (13.0±0.6 wt% Pb), bow (11.9±0.4 wt% Pb) and foot (12.5 ± 0.9 wt% Pb). These show a higher Pb content, suggesting a cast bronze. The spiral (3.2 ± 0.2 wt% Pb), which is part of the other workpiece, has a comparatively lower Pb content, suggesting a forged bronze.
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Affiliation(s)
- Sayani Biswas
- Paul Scherrer Institute PSI, 5232 Villigen, Switzerland
| | - Isabel Megatli-Niebel
- Archäologisches Institut, Universität zu Köln, Albertus-Magnus-Platz, 50923 Köln, Germany
- Augusta Raurica, Schwarzackerstrasse 2, 4302 Augst, Switzerland
| | - Lilian Raselli
- Augusta Raurica, Schwarzackerstrasse 2, 4302 Augst, Switzerland
| | - Ronald Simke
- Augusta Raurica, Schwarzackerstrasse 2, 4302 Augst, Switzerland
| | | | - Nilesh Deokar
- PRISMA+ Cluster of Excellence and Institute of Nuclear Physics, Johannes Gutenberg Universität Mainz, 55128 Mainz, Germany
| | | | - Lars Gerchow
- Paul Scherrer Institute PSI, 5232 Villigen, Switzerland
| | - Herbert Hess
- Institut für Kernphysik, Universität zu Köln, Zülpicher Strasse 77, 50937 Köln, Germany
| | | | | | | | | | - Angela Papa
- Paul Scherrer Institute PSI, 5232 Villigen, Switzerland
- Departimento di Fisica, Università di Pisa and INFN sez. Pisa, Largo B. Pontecorvo 3, 56127 Pisa, Italy
| | | | - Peter Reiter
- Institut für Kernphysik, Universität zu Köln, Zülpicher Strasse 77, 50937 Köln, Germany
| | - Akira Sato
- Graduate School of Science, Osaka University, Toyonaka, Osaka Japan
| | - Nathal Severijns
- KU Leuven, Instituut voor Kern-en Stralingfysica, 3001 Leuven, Belgium
| | - Toni Shiroka
- Paul Scherrer Institute PSI, 5232 Villigen, Switzerland
| | - Michael Seidlitz
- Institut für Kernphysik, Universität zu Köln, Zülpicher Strasse 77, 50937 Köln, Germany
| | - Stergiani Marina Vogiatzi
- Paul Scherrer Institute PSI, 5232 Villigen, Switzerland
- Institute for Particle Physics and Astrophysics, ETH Zürich, 8093 Zürich, Switzerland
| | - Chennan Wang
- Paul Scherrer Institute PSI, 5232 Villigen, Switzerland
| | - Frederik Wauters
- PRISMA+ Cluster of Excellence and Institute of Nuclear Physics, Johannes Gutenberg Universität Mainz, 55128 Mainz, Germany
| | - Nigel Warr
- Institut für Kernphysik, Universität zu Köln, Zülpicher Strasse 77, 50937 Köln, Germany
| | - Alex Amato
- Paul Scherrer Institute PSI, 5232 Villigen, Switzerland
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11
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Kintzel B, Böhme M, Plaul D, Görls H, Yeche N, Seewald F, Klauss HH, Zvyagin AA, Kampert E, Herrmannsdörfer T, Pascua G, Baines C, Luetkens H, Plass W. A Trinuclear High-Spin Iron(III) Complex with a Geometrically Frustrated Spin Ground State Featuring Negligible Magnetic Anisotropy and Antisymmetric Exchange. Inorg Chem 2023; 62:3420-3430. [PMID: 36796032 DOI: 10.1021/acs.inorgchem.2c03455] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
The trinuclear high-spin iron(III) complex [Fe3Cl3(saltagBr)(py)6]ClO4 {H5saltagBr = 1,2,3-tris[(5-bromo-salicylidene)amino]guanidine} was synthesized and characterized by several experimental and theoretical methods. The iron(III) complex exhibits molecular 3-fold symmetry imposed by the rigid ligand backbone and crystallizes in trigonal space group P3̅ with the complex cation lying on a crystallographic C3 axis. The high-spin states (S = 5/2) of the individual iron(III) ions were determined by Mößbauer spectroscopy and confirmed by CASSCF/CASPT2 ab initio calculations. Magnetic measurements show an antiferromagnetic exchange between the iron(III) ions leading to a geometrically spin-frustrated ground state. This was complemented by high-field magnetization experiments up to 60 T, which confirm the isotropic nature of the magnetic exchange and negligible single-ion anisotropy for the iron(III) ions. Muon-spin relaxation experiments were performed and further prove the isotropic nature of the coupled spin ground state and the presence of isolated paramagnetic molecular systems with negligible intermolecular interactions down to 20 mK. Broken-symmetry density functional theory calculations are consistent with the antiferromagnetic exchange between the iron(III) ions within the presented trinuclear high-spin iron(III) complex. Ab initio calculations further support the absence of appreciable magnetic anisotropy (D = 0.086, and E = 0.010 cm-1) and the absence of significant contributions from antisymmetric exchange, as the two Kramers doublets are virtually degenerate (ΔE = 0.005 cm-1). Therefore, this trinuclear high-spin iron(III) complex should be an ideal candidate for further investigations of spin-electric effects arising exclusively from the spin chirality of a geometrically frustrated S = 1/2 spin ground state of the molecular system.
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Affiliation(s)
- Benjamin Kintzel
- Institut für Anorganische und Analytische Chemie, Friedrich-Schiller-Universität Jena, 07743 Jena, Germany
| | - Michael Böhme
- Institut für Anorganische und Analytische Chemie, Friedrich-Schiller-Universität Jena, 07743 Jena, Germany
| | - Daniel Plaul
- Institut für Anorganische und Analytische Chemie, Friedrich-Schiller-Universität Jena, 07743 Jena, Germany
| | - Helmar Görls
- Institut für Anorganische und Analytische Chemie, Friedrich-Schiller-Universität Jena, 07743 Jena, Germany
| | - Nicolas Yeche
- Institut für Festkörper- und Materialphysik, Technische Universität Dresden, 01069 Dresden, Germany
| | - Felix Seewald
- Institut für Festkörper- und Materialphysik, Technische Universität Dresden, 01069 Dresden, Germany
| | - Hans-Henning Klauss
- Institut für Festkörper- und Materialphysik, Technische Universität Dresden, 01069 Dresden, Germany
| | - Andrei A Zvyagin
- Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, Kharkiv 61103, Ukraine.,V. N. Karazin Kharkiv National University, Kharkiv 61022, Ukraine.,Max-Planck Institut für Physik komplexer Systeme, 01187 Dresden, Germany
| | - Erik Kampert
- Hochfeld-Magnetlabor Dresden, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
| | - Thomas Herrmannsdörfer
- Hochfeld-Magnetlabor Dresden, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
| | - Gwendolyne Pascua
- Laboratory for Muon Spin Spectroscopy, Paul-Scherrer-Institute, 5232 Villigen, Switzerland
| | - Christopher Baines
- Laboratory for Muon Spin Spectroscopy, Paul-Scherrer-Institute, 5232 Villigen, Switzerland
| | - Hubertus Luetkens
- Laboratory for Muon Spin Spectroscopy, Paul-Scherrer-Institute, 5232 Villigen, Switzerland
| | - Winfried Plass
- Institut für Anorganische und Analytische Chemie, Friedrich-Schiller-Universität Jena, 07743 Jena, Germany
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12
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Simutis G, Bollhalder A, Zolliker M, Küspert J, Wang Q, Das D, Van Leeuwen F, Ivashko O, Gutowski O, Philippe J, Kracht T, Glaevecke P, Adachi T, V Zimmermann M, Van Petegem S, Luetkens H, Guguchia Z, Chang J, Sassa Y, Bartkowiak M, Janoschek M. In situ uniaxial pressure cell for x-ray and neutron scattering experiments. Rev Sci Instrum 2023; 94:013906. [PMID: 36725613 DOI: 10.1063/5.0114892] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Accepted: 12/24/2022] [Indexed: 06/18/2023]
Abstract
We present an in situ uniaxial pressure device optimized for small angle x-ray and neutron scattering experiments at low-temperatures and high magnetic fields. A stepper motor generates force, which is transmitted to the sample via a rod with an integrated transducer that continuously monitors the force. The device has been designed to generate forces up to 200 N in both compressive and tensile configurations, and a feedback control allows operating the system in a continuous-pressure mode as the temperature is changed. The uniaxial pressure device can be used for various instruments and multiple cryostats through simple and exchangeable adapters. It is compatible with multiple sample holders, which can be easily changed depending on the sample properties and the desired experiment and allow rapid sample changes.
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Affiliation(s)
- G Simutis
- Laboratory for Neutron and Muon Instrumentation, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - A Bollhalder
- Laboratory for Neutron and Muon Instrumentation, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - M Zolliker
- Laboratory for Neutron and Muon Instrumentation, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - J Küspert
- Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
| | - Q Wang
- Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
| | - D Das
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Villigen PSI, Switzerland
| | - F Van Leeuwen
- Laboratory for Neutron and Muon Instrumentation, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - O Ivashko
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - O Gutowski
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - J Philippe
- Laboratory for Neutron and Muon Instrumentation, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - T Kracht
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - P Glaevecke
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - T Adachi
- Department of Engineering and Applied Sciences, Sophia University, Chiyoda, Tokyo, 102-8554, Japan
| | - M V Zimmermann
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - S Van Petegem
- Structure and Mechanics of Advanced Materials, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - H Luetkens
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Villigen PSI, Switzerland
| | - Z Guguchia
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Villigen PSI, Switzerland
| | - J Chang
- Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
| | - Y Sassa
- Department of Physics, Chalmers University of Technology, SE-41296 Göteborg, Sweden
| | - M Bartkowiak
- Laboratory for Neutron and Muon Instrumentation, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - M Janoschek
- Laboratory for Neutron and Muon Instrumentation, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
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13
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Mielke Iii C, Liu H, Das D, Yin JX, Deng LZ, Spring J, Gupta R, Medarde M, Chu CW, Khasanov R, Hasan ZM, Shi Y, Luetkens H, Guguchia Z. Local spectroscopic evidence for a nodeless magnetic kagome superconductor CeRu 2. J Phys Condens Matter 2022; 34:485601. [PMID: 36202080 DOI: 10.1088/1361-648x/ac9813] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Accepted: 10/06/2022] [Indexed: 06/16/2023]
Abstract
We report muon spin rotation (µSR) experiments on the microscopic properties of superconductivity and magnetism in the kagome superconductor CeRu2withTc≃5 K. From the measurements of the temperature-dependent magnetic penetration depthλ, the superconducting order parameter exhibits nodeless pairing, which fits best to an anisotropics-wave gap symmetry. We further show that theTc/λ-2ratio is comparable to that of unconventional superconductors. Furthermore, the powerful combination of zero-field (ZF)-µSR and high-fieldµSR has been used to uncover magnetic responses across three characteristic temperatures, identified asT1∗≃110 K,T2∗≃65 K, andT3∗≃40 K. Our experiments classify CeRu2as an exceedingly rare nodeless magnetic kagome superconductor.
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Affiliation(s)
- C Mielke Iii
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
- Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
| | - H Liu
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - D Das
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - J-X Yin
- Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7), Department of Physics, Princeton University, Princeton, NJ 08544, United States of America
| | - L Z Deng
- Department of Physics and Texas Center for Superconductivity, University of Houston, Houston, TX, United States of America
| | - J Spring
- Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
| | - R Gupta
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - M Medarde
- Laboratory for Multiscale Materials Experiments, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - C-W Chu
- Department of Physics and Texas Center for Superconductivity, University of Houston, Houston, TX, United States of America
- Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States of America
| | - R Khasanov
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Z M Hasan
- Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7), Department of Physics, Princeton University, Princeton, NJ 08544, United States of America
- Princeton Institute for the Science and Technology of Materials, Princeton University, Princeton, NJ 08540, United States of America
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States of America
- Quantum Science Center, Oak Ridge, TN 37831, United States of America
| | - Y Shi
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - H Luetkens
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Z Guguchia
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
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14
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López-Paz SA, Guguchia Z, Pomjakushin VY, Witteveen C, Cervellino A, Luetkens H, Casati N, Morpurgo AF, von Rohr FO. Dynamic magnetic crossover at the origin of the hidden-order in van der Waals antiferromagnet CrSBr. Nat Commun 2022; 13:4745. [PMID: 35961970 PMCID: PMC9374657 DOI: 10.1038/s41467-022-32290-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Accepted: 07/20/2022] [Indexed: 11/09/2022] Open
Abstract
The van-der-Waals material CrSBr stands out as a promising two-dimensional magnet. Here, we report on its detailed magnetic and structural characteristics. We evidence that it undergoes a transition to an A-type antiferromagnetic state below TN ≈ 140 K with a pronounced two-dimensional character, preceded by ferromagnetic correlations within the monolayers. Furthermore, we unravel the low-temperature hidden-order within the long-range magnetically-ordered state. We find that it is associated to a slowing down of the magnetic fluctuations, accompanied by a continuous reorientation of the internal field. These take place upon cooling below Ts ≈ 100 K, until a spin freezing process occurs at T* ≈ 40 K. We argue this complex behavior to reflect a crossover driven by the in-plane uniaxial anisotropy, which is ultimately caused by its mixed-anion character. Our findings reinforce CrSBr as an important candidate for devices in the emergent field of two-dimensional magnetic materials.
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Affiliation(s)
- Sara A López-Paz
- Department of Quantum Matter Physics, University of Geneva, CH-1211, Geneva, Switzerland. .,Department of Chemistry, University of Zurich, CH-8057, Zurich, Switzerland.
| | - Zurab Guguchia
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, CH-5232, Villigen PSI, Switzerland
| | - Vladimir Y Pomjakushin
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, CH-5232, Villigen PSI, Switzerland
| | - Catherine Witteveen
- Department of Quantum Matter Physics, University of Geneva, CH-1211, Geneva, Switzerland.,Department of Chemistry, University of Zurich, CH-8057, Zurich, Switzerland
| | - Antonio Cervellino
- Laboratory for Synchrotron Radiation - Condensed Matter, Paul Scherrer Institut, CH-5232, Villigen PSI, Switzerland
| | - Hubertus Luetkens
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, CH-5232, Villigen PSI, Switzerland
| | - Nicola Casati
- Laboratory for Synchrotron Radiation - Condensed Matter, Paul Scherrer Institut, CH-5232, Villigen PSI, Switzerland
| | - Alberto F Morpurgo
- Department of Quantum Matter Physics, University of Geneva, CH-1211, Geneva, Switzerland.,Department of Applied Physics, University of Geneva, CH-1211, Geneva, Switzerland
| | - Fabian O von Rohr
- Department of Quantum Matter Physics, University of Geneva, CH-1211, Geneva, Switzerland.
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15
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Duan Q, Bu H, Pomjakushin V, Luetkens H, Li Y, Zhao J, Gardner JS, Guo H. Anomalous Ferromagnetic Behavior in Orthorhombic Li 3Co 2SbO 6. Inorg Chem 2022; 61:10880-10887. [DOI: 10.1021/acs.inorgchem.2c01293] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Qianhui Duan
- School of Physics and Hangzhou Key Laboratory of Quantum Matters, Hangzhou Normal University, Hangzhou 311121, China
- Neutron Science Platform, Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
| | - Huanpeng Bu
- Neutron Science Platform, Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
| | - Vladimir Pomjakushin
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - Hubertus Luetkens
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - Yuke Li
- School of Physics and Hangzhou Key Laboratory of Quantum Matters, Hangzhou Normal University, Hangzhou 311121, China
| | - Jinkui Zhao
- Neutron Science Platform, Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
| | - Jason S. Gardner
- Material Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Hanjie Guo
- Neutron Science Platform, Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
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16
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Ivko S, Tustain K, Dolling T, Abdeldaim A, Mustonen OHJ, Manuel P, Wang C, Luetkens H, Clark L. Uncovering the Kagome Ferromagnet within a Family of Metal-Organic Frameworks. Chem Mater 2022; 34:5409-5421. [PMID: 36160701 PMCID: PMC9490827 DOI: 10.1021/acs.chemmater.2c00289] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Revised: 05/19/2022] [Indexed: 06/16/2023]
Abstract
Kagome networks of ferromagnetically or antiferromagnetically coupled magnetic moments represent important models in the pursuit of a diverse array of novel quantum and topological states of matter. Here, we explore a family of Cu2+-containing metal-organic frameworks (MOFs) bearing kagome layers pillared by ditopic organic linkers with the general formula Cu3(CO3)2(x)3·2ClO4 (MOF-x), where x is 1,2-bis(4-pyridyl)ethane (bpe), 1,2-bis(4-pyridyl)ethylene (bpy), or 4,4'-azopyridine (azpy). Despite more than a decade of investigation, the nature of the magnetic exchange interactions in these materials remained unclear, meaning that whether the underlying magnetic model is that of an kagome ferromagnet or antiferromagnet is unknown. Using single-crystal X-ray diffraction, we have developed a chemically intuitive crystal structure for this family of materials. Then, through a combination of magnetic susceptibility, powder neutron diffraction, and muon-spin spectroscopy measurements, we show that the magnetic ground state of this family consists of ferromagnetic kagome layers that are coupled antiferromagnetically via their extended organic pillaring linkers.
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Affiliation(s)
- Samuel
A. Ivko
- School
of Chemistry, University of Birmingham, Birmingham B15 2TT, U.K.
| | - Katherine Tustain
- Department
of Chemistry and Materials Innovation Factory, University of Liverpool, Liverpool L7 3NY, U.K.
| | - Tristan Dolling
- School
of Chemistry, University of Birmingham, Birmingham B15 2TT, U.K.
| | - Aly Abdeldaim
- School
of Chemistry, University of Birmingham, Birmingham B15 2TT, U.K.
- ISIS
Neutron and Muon Source, Rutherford Appleton
Laboratory, Didcot OX11 0QX, U.K.
| | | | - Pascal Manuel
- ISIS
Neutron and Muon Source, Rutherford Appleton
Laboratory, Didcot OX11 0QX, U.K.
| | - Chennan Wang
- Swiss
Muon Source, Paul Scherrer Institut, Villigen 5232, Switzerland
| | - Hubertus Luetkens
- Swiss
Muon Source, Paul Scherrer Institut, Villigen 5232, Switzerland
| | - Lucy Clark
- School
of Chemistry, University of Birmingham, Birmingham B15 2TT, U.K.
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17
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Bahrami F, Hu X, Du Y, Lebedev OI, Wang C, Luetkens H, Fabbris G, Graf MJ, Haskel D, Ran Y, Tafti F. First demonstration of tuning between the Kitaev and Ising limits in a honeycomb lattice. Sci Adv 2022; 8:eabl5671. [PMID: 35319975 PMCID: PMC8942356 DOI: 10.1126/sciadv.abl5671] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Accepted: 02/01/2022] [Indexed: 06/02/2023]
Abstract
Recent observations of novel spin-orbit coupled states have generated interest in 4d/5d transition metal systems. A prime example is the [Formula: see text] state in iridate materials and α-RuCl3 that drives Kitaev interactions. Here, by tuning the competition between spin-orbit interaction (λSOC) and trigonal crystal field (ΔT), we restructure the spin-orbital wave functions into a previously unobserved [Formula: see text] state that drives Ising interactions. This is done via a topochemical reaction that converts Li2RhO3 to Ag3LiRh2O6. Using perturbation theory, we present an explicit expression for the [Formula: see text] state in the limit ΔT ≫ λSOC realized in Ag3LiRh2O6, different from the conventional [Formula: see text] state in the limit λSOC ≫ ΔT realized in Li2RhO3. The change of ground state is followed by a marked change of magnetism from a 6 K spin-glass in Li2RhO3 to a 94 K antiferromagnet in Ag3LiRh2O6.
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Affiliation(s)
- Faranak Bahrami
- Department of Physics, Boston College, Chestnut Hill, MA 02467, USA
| | - Xiaodong Hu
- Department of Physics, Boston College, Chestnut Hill, MA 02467, USA
| | - Yonghua Du
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Oleg I. Lebedev
- Laboratoire CRISMAT, ENSICAEN-CNRS UMR6508, 14050 Caen, France
| | - Chennan Wang
- Laboratory for Muon Spin Spectroscopy (LMU), Paul Scherrer Institute (PSI), CH-5232 Villigen, Switzerland
| | - Hubertus Luetkens
- Laboratory for Muon Spin Spectroscopy (LMU), Paul Scherrer Institute (PSI), CH-5232 Villigen, Switzerland
| | - Gilberto Fabbris
- Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA
| | - Michael J. Graf
- Department of Physics, Boston College, Chestnut Hill, MA 02467, USA
| | - Daniel Haskel
- Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA
| | - Ying Ran
- Department of Physics, Boston College, Chestnut Hill, MA 02467, USA
| | - Fazel Tafti
- Department of Physics, Boston College, Chestnut Hill, MA 02467, USA
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18
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Das D, Gupta R, Baines C, Luetkens H, Kaczorowski D, Guguchia Z, Khasanov R. Unconventional Pressure Dependence of the Superfluid Density in the Nodeless Topological Superconductor α-PdBi_{2}. Phys Rev Lett 2021; 127:217002. [PMID: 34860073 DOI: 10.1103/physrevlett.127.217002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Revised: 10/18/2021] [Accepted: 10/20/2021] [Indexed: 06/13/2023]
Abstract
We investigated the superconducting properties of the topological superconductor α-PdBi_{2} at ambient and external pressures up to 1.77 GPa using muon spin rotation experiments. The ambient pressure measurements evince a fully gapped s-wave superconducting state in the bulk of the specimen. Alternating current magnetic susceptibility and muon spin rotation measurements manifest a continuous suppression of T_{c} with increasing pressure. In parallel, we observed a significant decrease of superfluid density by ∼20% upon application of external pressure. Remarkably, the superfluid density follows a linear relation with T_{c}, which was found before in some unconventional topological superconductors and hole-doped cuprates. This finding signals a possible crossover from Bose-Einstein to Bardeen-Cooper-Schrieffer like condensation in α-PdBi_{2}.
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Affiliation(s)
- Debarchan Das
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Ritu Gupta
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Christopher Baines
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Hubertus Luetkens
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Dariusz Kaczorowski
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Wrocław, ul. Okólna 2, 50-422, Poland
| | - Zurab Guguchia
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Rustem Khasanov
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
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19
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Meseguer-Sánchez J, Popescu C, García-Muñoz JL, Luetkens H, Taniashvili G, Navarro-Moratalla E, Guguchia Z, Santos EJG. Coexistence of structural and magnetic phases in van der Waals magnet CrI 3. Nat Commun 2021; 12:6265. [PMID: 34725340 PMCID: PMC8560937 DOI: 10.1038/s41467-021-26342-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2020] [Accepted: 09/28/2021] [Indexed: 11/17/2022] Open
Abstract
CrI3 has raised as an important system to the emergent field of two-dimensional van der Waals magnetic materials. However, it is still unclear why CrI3 which has a ferromagnetic rhombohedral structure in bulk, changed to anti-ferromagnetic monoclinic at thin layers. Here we show that this behaviour is due to the coexistence of both monoclinic and rhombohedral crystal phases followed by three magnetic transitions at TC1 = 61 K, TC2 = 50 K and TC3 = 25 K. Each transition corresponds to a certain fraction of the magnetically ordered volume as well as monoclinic and rhombohedral proportion. The different phases are continuously accessed as a function of the temperature over a broad range of magnitudes. Our findings suggest that the challenge of understanding the magnetic properties of thin layers CrI3 is in general a coexisting structural-phase problem mediated by the volume-wise competition between magnetic phases already present in bulk. CrI3 is a popular van der Waals magnet that exhibits anomalous magnetic properties between bulk and thin layers due to different crystal symmetry. Here, the authors report the coexistence of different magnetostructural phases over the entire range of temperatures, solving a long-standing puzzle.
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Affiliation(s)
| | - Catalin Popescu
- CELLS-ALBA Synchrotron Light Facility, Cerdanyola del Valles, Barcelona, 08290, Spain
| | - José Luis García-Muñoz
- Institut de Ciència de Materials de Barcelona (ICMAB), CSIC, Bellaterra, Catalunya, Spain
| | - Hubertus Luetkens
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Villigen PSI, Switzerland
| | | | | | - Zurab Guguchia
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Villigen PSI, Switzerland.
| | - Elton J G Santos
- Institute for Condensed Matter Physics and Complex Systems, School of Physics and Astronomy, The University of Edinburgh, Edinburgh, EH9 3FD, UK. .,Higgs Centre for Theoretical Physics, The University of Edinburgh, Edinburgh, EH9 3FD, UK.
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20
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Živković I, Favre V, Salazar Mejia C, Jeschke HO, Magrez A, Dabholkar B, Noculak V, Freitas RS, Jeong M, Hegde NG, Testa L, Babkevich P, Su Y, Manuel P, Luetkens H, Baines C, Baker PJ, Wosnitza J, Zaharko O, Iqbal Y, Reuther J, Rønnow HM. Magnetic Field Induced Quantum Spin Liquid in the Two Coupled Trillium Lattices of K_{2}Ni_{2}(SO_{4})_{3}. Phys Rev Lett 2021; 127:157204. [PMID: 34677991 DOI: 10.1103/physrevlett.127.157204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Revised: 08/04/2021] [Accepted: 09/08/2021] [Indexed: 06/13/2023]
Abstract
Quantum spin liquids are exotic states of matter that form when strongly frustrated magnetic interactions induce a highly entangled quantum paramagnet far below the energy scale of the magnetic interactions. Three-dimensional cases are especially challenging due to the significant reduction of the influence of quantum fluctuations. Here, we report the magnetic characterization of K_{2}Ni_{2}(SO_{4})_{3} forming a three-dimensional network of Ni^{2+} spins. Using density functional theory calculations, we show that this network consists of two interconnected spin-1 trillium lattices. In the absence of a magnetic field, magnetization, specific heat, neutron scattering, and muon spin relaxation experiments demonstrate a highly correlated and dynamic state, coexisting with a peculiar, very small static component exhibiting a strongly renormalized moment. A magnetic field B≳4 T diminishes the ordered component and drives the system into a pure quantum spin liquid state. This shows that a system of interconnected S=1 trillium lattices exhibits a significantly elevated level of geometrical frustration.
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Affiliation(s)
- Ivica Živković
- Laboratory for Quantum Magnetism, Institute of Physics, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Virgile Favre
- Laboratory for Quantum Magnetism, Institute of Physics, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Catalina Salazar Mejia
- Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
| | - Harald O Jeschke
- Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan
| | - Arnaud Magrez
- Crystal Growth Facility, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Bhupen Dabholkar
- Department of Physics and Quantum Centers in Diamond and Emerging Materials (QuCenDiEM) Group, Indian Institute of Technology Madras, Chennai 600036, India
| | - Vincent Noculak
- Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin, 14195 Berlin, Germany
- Helmholtz-Zentrum für Materialien und Energie, Hahn-Meitner-Platz 1, 14109 Berlin, Germany
| | - Rafael S Freitas
- 7 Instituto de Física, Universidade de São Paulo, 05508-090 São Paulo, Brazil
| | - Minki Jeong
- School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom
| | - Nagabhushan G Hegde
- Laboratory for Quantum Magnetism, Institute of Physics, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Luc Testa
- Laboratory for Quantum Magnetism, Institute of Physics, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Peter Babkevich
- Laboratory for Quantum Magnetism, Institute of Physics, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Yixi Su
- Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich, Lichtenbergstrasse 1, D-85747 Garching, Germany
| | - Pascal Manuel
- ISIS Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0QX, United Kingdom
| | - Hubertus Luetkens
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - Christopher Baines
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - Peter J Baker
- ISIS Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0QX, United Kingdom
| | - Jochen Wosnitza
- Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
- Institut für Festkörper- und Materialphysik, TU Dresden, 01062 Dresden, Germany
| | - Oksana Zaharko
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, CH-5253 Villigen, Switzerland
| | - Yasir Iqbal
- Department of Physics and Quantum Centers in Diamond and Emerging Materials (QuCenDiEM) Group, Indian Institute of Technology Madras, Chennai 600036, India
| | - Johannes Reuther
- Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin, 14195 Berlin, Germany
- Helmholtz-Zentrum für Materialien und Energie, Hahn-Meitner-Platz 1, 14109 Berlin, Germany
| | - Henrik M Rønnow
- Laboratory for Quantum Magnetism, Institute of Physics, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
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21
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Gurung N, Wang C, Bingham NS, Verezhak JAT, Yamaura K, Allodi G, Forino PC, Sanna S, Luetkens H, Scagnoli V. Probing spin fluctuations in NaOsO 3by muon spin rotation and NMR spectroscopy. J Phys Condens Matter 2021; 33:335802. [PMID: 34062527 DOI: 10.1088/1361-648x/ac06eb] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Accepted: 06/01/2021] [Indexed: 06/12/2023]
Abstract
We have used muon spin rotation and relaxation (μSR) and23Na nuclear magnetic resonance (NMR) spectroscopic methods in the NaOsO3antiferromagnetic phase to determine the temperature evolution of the magnetic order parameter and the role of the magnetic fluctuations at the Néel temperature. Additionally, we performed muon spin relaxation measurements in the vicinity ofTA= 30 K, where the appearance of an anomaly in the electrical resistivity was suggested to be due to a progressive reduction of the Os magnetic moment associated with spin fluctuation. Our measurements suggest the absence of prominent change in the spin fluctuations frequency atTA, within the muon probing time scale and the absence of a reduction of the localized Os magnetic moment reflected by the stability within few permille of the local magnetic field strength sensed by the muons below 50 K.
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Affiliation(s)
- Namrata Gurung
- Laboratory for Mesoscopic Systems, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland
- Laboratory for Multiscale Materials Experiments, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - Chennan Wang
- Laboratory for Muon Spin Spectroscopy (LMU), Paul Scherrer Institute (PSI), CH-5232 Villigen, Switzerland
| | - Nicholas S Bingham
- Department of Applied Physics, Yale University, New Haven, Connecticut 06511, United States of America
| | - Joel A T Verezhak
- Laboratory for Muon Spin Spectroscopy (LMU), Paul Scherrer Institute (PSI), CH-5232 Villigen, Switzerland
| | - Kazunari Yamaura
- International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Giuseppe Allodi
- Dipartimento di Scienze Matematiche, Fisiche e Informatiche, Università di Parma, I-43124 Parma, Italy
| | - Paola Caterina Forino
- Department of Physics and Astronomy 'A. Righi', University of Bologna, via Berti-Pichat 6-2, 40127 Bologna, Italy
| | - Samuele Sanna
- Department of Physics and Astronomy 'A. Righi', University of Bologna, via Berti-Pichat 6-2, 40127 Bologna, Italy
| | - Hubertus Luetkens
- Laboratory for Muon Spin Spectroscopy (LMU), Paul Scherrer Institute (PSI), CH-5232 Villigen, Switzerland
| | - V Scagnoli
- Laboratory for Mesoscopic Systems, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland
- Laboratory for Multiscale Materials Experiments, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
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22
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Khatua J, Arh T, Mishra SB, Luetkens H, Zorko A, Sana B, Rao MSR, Nanda BRK, Khuntia P. Development of short and long-range magnetic order in the double perovskite based frustrated triangular lattice antiferromagnet Ba[Formula: see text]MnTeO[Formula: see text]. Sci Rep 2021; 11:6959. [PMID: 33772050 PMCID: PMC7997969 DOI: 10.1038/s41598-021-84876-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Accepted: 02/15/2021] [Indexed: 12/04/2022] Open
Abstract
Frustrated magnets based on oxide double perovskites offer a viable ground wherein competing magnetic interactions, macroscopic ground state degeneracy and complex interplay between emergent degrees of freedom can lead to correlated quantum phenomena with exotic excitations highly relevant for potential technological applications. By local-probe muon spin relaxation ([Formula: see text]SR) and complementary thermodynamic measurements accompanied by first-principles calculations, we here demonstrate novel electronic structure and magnetic phases of Ba[Formula: see text]MnTeO[Formula: see text], where Mn[Formula: see text] ions with S = 5/2 spins constitute a perfect triangular lattice. Magnetization results evidence the presence of strong antiferromagnetic interactions between Mn[Formula: see text] spins and a phase transition at [Formula: see text] = 20 K. Below [Formula: see text], the specific heat data show antiferromagnetic magnon excitations with a gap of 1.4 K, which is due to magnetic anisotropy. [Formula: see text]SR reveals the presence of static internal fields in the ordered state and short-range spin correlations high above [Formula: see text]. It further unveils critical slowing-down of spin dynamics at [Formula: see text] and the persistence of spin dynamics even in the magnetically ordered state. Theoretical studies infer that Heisenberg interactions govern the inter- and intra-layer spin-frustration in this compound. Our results establish that the combined effect of a weak third-nearest-neighbour ferromagnetic inter-layer interaction (owing to double-exchange) and intra-layer interactions stabilizes a three-dimensional magnetic ordering in this frustrated magnet.
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Affiliation(s)
- J. Khatua
- Department of Physics, Indian Institute of Technology Madras, Chennai, 600036 India
- Quantum Centre for Diamond and Emergent Materials, Indian Institute of Technology Madras, Chennai, 600036 India
- Functional Oxide Research Group, Indian Institute of Technology Madras, Chennai, 600036 India
| | - T. Arh
- Jožef Stefan Institute, Jamova c. 39, 1000 Ljubljana, Slovenia
- Faculty of Mathematics and Physics, University of Ljubljana, Jadranska u. 19, 1000 Ljubljana, Slovenia
| | - Shashi B. Mishra
- Condensed Matter Theory and Computational Lab, Department of Physics, Indian Institute of Technology Madras, Chennai, 600036 India
| | - H. Luetkens
- Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - A. Zorko
- Jožef Stefan Institute, Jamova c. 39, 1000 Ljubljana, Slovenia
- Faculty of Mathematics and Physics, University of Ljubljana, Jadranska u. 19, 1000 Ljubljana, Slovenia
| | - B. Sana
- Department of Physics, Indian Institute of Technology Madras, Chennai, 600036 India
| | - M. S. Ramachandra Rao
- Department of Physics, Nano Functional Materials Technology Centre and Materials Science Research Centre, Indian Institute of Technology Madras, Chennai, 600036 India
- Quantum Centre for Diamond and Emergent Materials, Indian Institute of Technology Madras, Chennai, 600036 India
| | - B. R. K. Nanda
- Condensed Matter Theory and Computational Lab, Department of Physics, Indian Institute of Technology Madras, Chennai, 600036 India
- Functional Oxide Research Group, Indian Institute of Technology Madras, Chennai, 600036 India
- Atomistic Modelling and Materials Design Group, Indian Institute of Technology Madras, Chennai, 600036 India
| | - P. Khuntia
- Department of Physics, Indian Institute of Technology Madras, Chennai, 600036 India
- Quantum Centre for Diamond and Emergent Materials, Indian Institute of Technology Madras, Chennai, 600036 India
- Functional Oxide Research Group, Indian Institute of Technology Madras, Chennai, 600036 India
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23
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Ghosh S, Brückner F, Nikitin A, Grinenko V, Elender M, Mackenzie AP, Luetkens H, Klauss HH, Hicks CW. Piezoelectric-driven uniaxial pressure cell for muon spin relaxation and neutron scattering experiments. Rev Sci Instrum 2020; 91:103902. [PMID: 33138607 DOI: 10.1063/5.0025307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2020] [Accepted: 10/03/2020] [Indexed: 06/11/2023]
Abstract
We present a piezoelectric-driven uniaxial pressure cell that is optimized for muon spin relaxation and neutron scattering experiments and that is operable over a wide temperature range including cryogenic temperatures. To accommodate the large samples required for these measurement techniques, the cell is designed to generate forces up to ∼1000 N. To minimize the background signal, the space around the sample is kept as open as possible. We demonstrate here that by mounting plate-like samples with epoxy, a uniaxial stress exceeding 1 GPa can be achieved in an active volume of at least 5 mm3. We show that for practical operation, it is important to monitor both the force and displacement applied to the sample. In addition, because time is critical during facility experiments, samples are mounted in detachable holders that can be rapidly exchanged. The piezoelectric actuators are likewise contained in an exchangeable cartridge.
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Affiliation(s)
- Shreenanda Ghosh
- Institute for Solid State and Materials Physics, Technical University of Dresden, D-01069 Dresden, Germany
| | - Felix Brückner
- Institute for Solid State and Materials Physics, Technical University of Dresden, D-01069 Dresden, Germany
| | - Artem Nikitin
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - Vadim Grinenko
- Institute for Solid State and Materials Physics, Technical University of Dresden, D-01069 Dresden, Germany
| | - Matthias Elender
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - Andrew P Mackenzie
- Max Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany
| | - Hubertus Luetkens
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - Hans-Henning Klauss
- Institute for Solid State and Materials Physics, Technical University of Dresden, D-01069 Dresden, Germany
| | - Clifford W Hicks
- Max Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany
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24
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Guguchia Z, Das D, Wang CN, Adachi T, Kitajima N, Elender M, Brückner F, Ghosh S, Grinenko V, Shiroka T, Müller M, Mudry C, Baines C, Bartkowiak M, Koike Y, Amato A, Tranquada JM, Klauss HH, Hicks CW, Luetkens H. Using Uniaxial Stress to Probe the Relationship between Competing Superconducting States in a Cuprate with Spin-stripe Order. Phys Rev Lett 2020; 125:097005. [PMID: 32915617 DOI: 10.1103/physrevlett.125.097005] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Accepted: 07/30/2020] [Indexed: 06/11/2023]
Abstract
We report muon spin rotation and magnetic susceptibility experiments on in-plane stress effects on the static spin-stripe order and superconductivity in the cuprate system La_{2-x}Ba_{x}CuO_{4} with x=0.115. An extremely low uniaxial stress of ∼0.1 GPa induces a substantial decrease in the magnetic volume fraction and a dramatic rise in the onset of 3D superconductivity, from ∼10 to 32 K; however, the onset of at-least-2D superconductivity is much less sensitive to stress. These results show not only that large-volume-fraction spin-stripe order is anticorrelated with 3D superconducting coherence but also that these states are energetically very finely balanced. Moreover, the onset temperatures of 3D superconductivity and spin-stripe order are very similar in the large stress regime. These results strongly suggest a similar pairing mechanism for spin-stripe order and the spatially modulated 2D and uniform 3D superconducting orders, imposing an important constraint on theoretical models.
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Affiliation(s)
- Z Guguchia
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - D Das
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - C N Wang
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - T Adachi
- Department of Engineering and Applied Sciences, Sophia University, 7-1 Kioi-cho, Chiyoda-ku, Tokyo 102-8554, Japan
| | - N Kitajima
- Department of Applied Physics, Tohoku University, 6-6-05 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan
| | - M Elender
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - F Brückner
- Institute for Solid State and Materials Physics, Technische Universität Dresden, D-01069 Dresden, Germany
| | - S Ghosh
- Institute for Solid State and Materials Physics, Technische Universität Dresden, D-01069 Dresden, Germany
| | - V Grinenko
- Institute for Solid State and Materials Physics, Technische Universität Dresden, D-01069 Dresden, Germany
- Leibniz-Institut für Festkörper- und Werkstoffforschung (IFW) Dresden, 01171 Dresden, Germany
| | - T Shiroka
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
- Laboratorium für Festkörperphysik, ETH Zürich, CH-8093 Zürich, Switzerland
| | - M Müller
- Condensed Matter Theory Group, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - C Mudry
- Condensed Matter Theory Group, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
- Institute of Physics, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - C Baines
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - M Bartkowiak
- Laboratory for Scientific Developments and Novel Materials, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
| | - Y Koike
- Department of Applied Physics, Tohoku University, 6-6-05 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan
| | - A Amato
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - J M Tranquada
- Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - H-H Klauss
- Institute for Solid State and Materials Physics, Technische Universität Dresden, D-01069 Dresden, Germany
| | - C W Hicks
- Max Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany
| | - H Luetkens
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
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25
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Guguchia Z, Verezhak JAT, Gawryluk DJ, Tsirkin SS, Yin JX, Belopolski I, Zhou H, Simutis G, Zhang SS, Cochran TA, Chang G, Pomjakushina E, Keller L, Skrzeczkowska Z, Wang Q, Lei HC, Khasanov R, Amato A, Jia S, Neupert T, Luetkens H, Hasan MZ. Tunable anomalous Hall conductivity through volume-wise magnetic competition in a topological kagome magnet. Nat Commun 2020; 11:559. [PMID: 31992705 PMCID: PMC6987130 DOI: 10.1038/s41467-020-14325-w] [Citation(s) in RCA: 70] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2019] [Accepted: 12/17/2019] [Indexed: 11/23/2022] Open
Abstract
Magnetic topological phases of quantum matter are an emerging frontier in physics and material science. Along these lines, several kagome magnets have appeared as the most promising platforms. Here, we explore magnetic correlations in the kagome magnet Co3Sn2S2. Using muon spin-rotation, we present evidence for competing magnetic orders in the kagome lattice of this compound. Our results show that while the sample exhibits an out-of-plane ferromagnetic ground state, an in-plane antiferromagnetic state appears at temperatures above 90 K, eventually attaining a volume fraction of 80% around 170 K, before reaching a non-magnetic state. Strikingly, the reduction of the anomalous Hall conductivity (AHC) above 90 K linearly follows the disappearance of the volume fraction of the ferromagnetic state. We further show that the competition of these magnetic phases is tunable through applying either an external magnetic field or hydrostatic pressure. Our results taken together suggest the thermal and quantum tuning of Berry curvature induced AHC via external tuning of magnetic order.
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Affiliation(s)
- Z Guguchia
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232, Villigen PSI, Switzerland.
- Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University, Princeton, NJ, 08544, USA.
| | - J A T Verezhak
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232, Villigen PSI, Switzerland
| | - D J Gawryluk
- Laboratory for Multiscale Materials Experiments, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland
| | - S S Tsirkin
- Department of Physics, University of Zürich, Winterthurerstrasse 190, Zurich, Switzerland
| | - J-X Yin
- Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University, Princeton, NJ, 08544, USA
| | - I Belopolski
- Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University, Princeton, NJ, 08544, USA
| | - H Zhou
- International Center for Quantum Materials and School of Physics, Peking University, Beijing, China
- CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Science, Beijing, China
| | - G Simutis
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232, Villigen PSI, Switzerland
| | - S-S Zhang
- Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University, Princeton, NJ, 08544, USA
| | - T A Cochran
- Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University, Princeton, NJ, 08544, USA
| | - G Chang
- Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University, Princeton, NJ, 08544, USA
| | - E Pomjakushina
- Laboratory for Multiscale Materials Experiments, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland
| | - L Keller
- Laboratory for Neutron Scattering, Paul Scherrer Institut, CH-5232, Villigen PSI, Switzerland
| | - Z Skrzeczkowska
- Laboratory for Multiscale Materials Experiments, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland
| | - Q Wang
- Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices, Renmin University of China, Beijing, China
| | - H C Lei
- Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices, Renmin University of China, Beijing, China
| | - R Khasanov
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232, Villigen PSI, Switzerland
| | - A Amato
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232, Villigen PSI, Switzerland
| | - S Jia
- International Center for Quantum Materials and School of Physics, Peking University, Beijing, China
- CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Science, Beijing, China
| | - T Neupert
- Department of Physics, University of Zürich, Winterthurerstrasse 190, Zurich, Switzerland
| | - H Luetkens
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232, Villigen PSI, Switzerland.
| | - M Z Hasan
- Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University, Princeton, NJ, 08544, USA.
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26
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von Rohr FO, Orain JC, Khasanov R, Witteveen C, Shermadini Z, Nikitin A, Chang J, Wieteska AR, Pasupathy AN, Hasan MZ, Amato A, Luetkens H, Uemura YJ, Guguchia Z. Unconventional scaling of the superfluid density with the critical temperature in transition metal dichalcogenides. Sci Adv 2019; 5:eaav8465. [PMID: 31819897 PMCID: PMC6884407 DOI: 10.1126/sciadv.aav8465] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Accepted: 09/17/2019] [Indexed: 06/10/2023]
Abstract
We report on muon spin rotation experiments probing the magnetic penetration depth λ(T) in the layered superconductors in 2H-NbSe2 and 4H-NbSe2. The current results, along with our earlier findings on 1T'-MoTe2 (Guguchia et al.), demonstrate that the superfluid density scales linearly with T c in the three transition metal dichalcogenide superconductors. Upon increasing pressure, we observe a substantial increase of the superfluid density in 2H-NbSe2, which we find to correlate with T c. The correlation deviates from the abovementioned linear trend. A similar deviation from the Uemura line was also observed in previous pressure studies of optimally doped cuprates. This correlation between the superfluid density and T c is considered a hallmark feature of unconventional superconductivity. Here, we show that this correlation is an intrinsic property of the superconductivity in transition metal dichalcogenides, whereas the ratio T c/T F is approximately a factor of 20 lower than the ratio observed in hole-doped cuprates. We, furthermore, find that the values of the superconducting gaps are insensitive to the suppression of the charge density wave state.
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Affiliation(s)
- F. O. von Rohr
- Department of Chemistry, University of Zürich, CH-8057 Zürich, Switzerland
- Physik-Institut der Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
| | - J.-C. Orain
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - R. Khasanov
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - C. Witteveen
- Department of Chemistry, University of Zürich, CH-8057 Zürich, Switzerland
| | - Z. Shermadini
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - A. Nikitin
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - J. Chang
- Physik-Institut der Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
| | - A. R. Wieteska
- Department of Physics, Columbia University, New York, NY 10027, USA
| | - A. N. Pasupathy
- Department of Physics, Columbia University, New York, NY 10027, USA
| | - M. Z. Hasan
- Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University, Princeton, NJ 08544, USA
| | - A. Amato
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - H. Luetkens
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Y. J. Uemura
- Department of Physics, Columbia University, New York, NY 10027, USA
| | - Z. Guguchia
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
- Department of Physics, Columbia University, New York, NY 10027, USA
- Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University, Princeton, NJ 08544, USA
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27
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Holenstein S, Stahl J, Shermadini Z, Simutis G, Grinenko V, Chareev DA, Khasanov R, Orain JC, Amato A, Klauss HH, Morenzoni E, Johrendt D, Luetkens H. Extended Magnetic Dome Induced by Low Pressures in Superconducting FeSe_{1-x}S_{x}. Phys Rev Lett 2019; 123:147001. [PMID: 31702214 DOI: 10.1103/physrevlett.123.147001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Indexed: 06/10/2023]
Abstract
We report muon spin rotation and magnetization measurements under pressure on Fe_{1+δ}Se_{1-x}S_{x} with x≈0.11. Above p≈0.6 GPa we find a microscopic coexistence of superconductivity with an extended dome of long range magnetic order that spans a pressure range between previously reported separated magnetic phases. The magnetism initially competes on an atomic scale with the coexisting superconductivity leading to a local maximum and minimum of the superconducting T_{c}(p). The maximum of T_{c} corresponds to the onset of magnetism while the minimum coincides with the pressure of strongest competition. A shift of the maximum of T_{c}(p) for a series of single crystals with x up to 0.14 roughly extrapolates to a putative magnetic and superconducting state at ambient pressure for x≥0.2.
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Affiliation(s)
- S Holenstein
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
- Physik-Institut der Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
| | - J Stahl
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13 (D), 81377 München, Germany
| | - Z Shermadini
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - G Simutis
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - V Grinenko
- Institute of Solid State and Materials Physics, TU Dresden, DE-01069 Dresden, Germany
- Institute for Metallic Materials, Leibniz IFW Dresden, DE-01069 Dresden, Germany
| | - D A Chareev
- RAS, Institute of Experimental Mineralogy, Chernogolovka 123456, Russia
- Ural Federal University, Ekaterinburg 620002, Russia
- Kazan Federal University, Kazan 420008, Russia
| | - R Khasanov
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - J-C Orain
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - A Amato
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - H-H Klauss
- Institute of Solid State and Materials Physics, TU Dresden, DE-01069 Dresden, Germany
| | - E Morenzoni
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
- Physik-Institut der Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
| | - D Johrendt
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13 (D), 81377 München, Germany
| | - H Luetkens
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
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28
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Guguchia Z, Kerelsky A, Edelberg D, Banerjee S, von Rohr F, Scullion D, Augustin M, Scully M, Rhodes DA, Shermadini Z, Luetkens H, Shengelaya A, Baines C, Morenzoni E, Amato A, Hone JC, Khasanov R, Billinge SJL, Santos E, Pasupathy AN, Uemura YJ. Magnetism in semiconducting molybdenum dichalcogenides. Sci Adv 2018; 4:eaat3672. [PMID: 30588488 PMCID: PMC6303124 DOI: 10.1126/sciadv.aat3672] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Accepted: 11/19/2018] [Indexed: 05/30/2023]
Abstract
Transition metal dichalcogenides (TMDs) are interesting for understanding the fundamental physics of two-dimensional (2D) materials as well as for applications to many emerging technologies, including spin electronics. Here, we report the discovery of long-range magnetic order below T M = 40 and 100 K in bulk semiconducting TMDs 2H-MoTe2 and 2H-MoSe2, respectively, by means of muon spin rotation (μSR), scanning tunneling microscopy (STM), and density functional theory (DFT) calculations. The μSR measurements show the presence of large and homogeneous internal magnetic fields at low temperatures in both compounds indicative of long-range magnetic order. DFT calculations show that this magnetism is promoted by the presence of defects in the crystal. The STM measurements show that the vast majority of defects in these materials are metal vacancies and chalcogen-metal antisites, which are randomly distributed in the lattice at the subpercent level. DFT indicates that the antisite defects are magnetic with a magnetic moment in the range of 0.9 to 2.8 μB. Further, we find that the magnetic order stabilized in 2H-MoTe2 and 2H-MoSe2 is highly sensitive to hydrostatic pressure. These observations establish 2H-MoTe2 and 2H-MoSe2 as a new class of magnetic semiconductors and open a path to studying the interplay of 2D physics and magnetism in these interesting semiconductors.
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Affiliation(s)
- Z. Guguchia
- Department of Physics, Columbia University, New York, NY 10027, USA
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - A. Kerelsky
- Department of Physics, Columbia University, New York, NY 10027, USA
| | - D. Edelberg
- Department of Physics, Columbia University, New York, NY 10027, USA
| | - S. Banerjee
- Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY 10027, USA
| | - F. von Rohr
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
| | - D. Scullion
- School of Mathematics and Physics, Queen’s University Belfast, Belfast, UK
| | - M. Augustin
- School of Mathematics and Physics, Queen’s University Belfast, Belfast, UK
| | - M. Scully
- School of Mathematics and Physics, Queen’s University Belfast, Belfast, UK
| | - D. A. Rhodes
- Department of Mechanical Engineering, Columbia University, New York, NY 10027, USA
| | - Z. Shermadini
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - H. Luetkens
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - A. Shengelaya
- Department of Physics, Tbilisi State University, Chavchavadze 3, GE-0128 Tbilisi, Georgia
- Andronikashvili Institute of Physics of I. Javakhishvili Tbilisi State University, Tamarashvili str. 6, 0177 Tbilisi, Georgia
| | - C. Baines
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - E. Morenzoni
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - A. Amato
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - J. C. Hone
- Department of Mechanical Engineering, Columbia University, New York, NY 10027, USA
| | - R. Khasanov
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - S. J. L. Billinge
- Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY 10027, USA
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - E. Santos
- School of Mathematics and Physics, Queen’s University Belfast, Belfast, UK
| | - A. N. Pasupathy
- Department of Physics, Columbia University, New York, NY 10027, USA
| | - Y. J. Uemura
- Department of Physics, Columbia University, New York, NY 10027, USA
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29
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Shekhar C, Kumar N, Grinenko V, Singh S, Sarkar R, Luetkens H, Wu SC, Zhang Y, Komarek AC, Kampert E, Skourski Y, Wosnitza J, Schnelle W, McCollam A, Zeitler U, Kübler J, Yan B, Klauss HH, Parkin SSP, Felser C. Anomalous Hall effect in Weyl semimetal half-Heusler compounds RPtBi (R = Gd and Nd). Proc Natl Acad Sci U S A 2018; 115:9140-9144. [PMID: 30154165 PMCID: PMC6140499 DOI: 10.1073/pnas.1810842115] [Citation(s) in RCA: 84] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Topological materials ranging from topological insulators to Weyl and Dirac semimetals form one of the most exciting current fields in condensed-matter research. Many half-Heusler compounds, RPtBi (R = rare earth), have been theoretically predicted to be topological semimetals. Among various topological attributes envisaged in RPtBi, topological surface states, chiral anomaly, and planar Hall effect have been observed experimentally. Here, we report an unusual intrinsic anomalous Hall effect (AHE) in the antiferromagnetic Heusler Weyl semimetal compounds GdPtBi and NdPtBi that is observed over a wide temperature range. In particular, GdPtBi exhibits an anomalous Hall conductivity of up to 60 Ω-1⋅cm-1 and an anomalous Hall angle as large as 23%. Muon spin-resonance (μSR) studies of GdPtBi indicate a sharp antiferromagnetic transition (TN) at 9 K without any noticeable magnetic correlations above TN Our studies indicate that Weyl points in these half-Heuslers are induced by a magnetic field via exchange splitting of the electronic bands at or near the Fermi energy, which is the source of the chiral anomaly and the AHE.
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Affiliation(s)
- Chandra Shekhar
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany;
| | - Nitesh Kumar
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - V Grinenko
- Institute for Solid State and Materials Physics, Faculty of Physics, Technische Universität Dresden, 01069 Dresden, Germany
- Leibniz Institute for Solid State and Materials Research Dresden, 01069 Dresden, Germany
| | - Sanjay Singh
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - R Sarkar
- Institute for Solid State and Materials Physics, Faculty of Physics, Technische Universität Dresden, 01069 Dresden, Germany
| | - H Luetkens
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Shu-Chun Wu
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - Yang Zhang
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | | | - Erik Kampert
- Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
| | - Yurii Skourski
- Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
| | - Jochen Wosnitza
- Institute for Solid State and Materials Physics, Faculty of Physics, Technische Universität Dresden, 01069 Dresden, Germany
- Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
| | - Walter Schnelle
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - Alix McCollam
- High Field Magnet Laboratory (HFML-EMFL), Radboud University, 6525 ED Nijmegen, The Netherlands
| | - Uli Zeitler
- High Field Magnet Laboratory (HFML-EMFL), Radboud University, 6525 ED Nijmegen, The Netherlands
| | - Jürgen Kübler
- Institute for Solid State Physics, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - Binghai Yan
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - H-H Klauss
- Institute for Solid State and Materials Physics, Faculty of Physics, Technische Universität Dresden, 01069 Dresden, Germany
| | - S S P Parkin
- Max Planck Institute of Microstructure Physics, 06120 Halle, Germany
| | - C Felser
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
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30
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Leo N, Holenstein S, Schildknecht D, Sendetskyi O, Luetkens H, Derlet PM, Scagnoli V, Lançon D, Mardegan JRL, Prokscha T, Suter A, Salman Z, Lee S, Heyderman LJ. Collective magnetism in an artificial 2D XY spin system. Nat Commun 2018; 9:2850. [PMID: 30030427 PMCID: PMC6054668 DOI: 10.1038/s41467-018-05216-2] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Accepted: 06/12/2018] [Indexed: 11/09/2022] Open
Abstract
Two-dimensional magnetic systems with continuous spin degrees of freedom exhibit a rich spectrum of thermal behaviour due to the strong competition between fluctuations and correlations. When such systems incorporate coupling via the anisotropic dipolar interaction, a discrete symmetry emerges, which can be spontaneously broken leading to a low-temperature ordered phase. However, the experimental realisation of such two-dimensional spin systems in crystalline materials is difficult since the dipolar coupling is usually much weaker than the exchange interaction. Here we realise two-dimensional magnetostatically coupled XY spin systems with nanoscale thermally active magnetic discs placed on square lattices. Using low-energy muon-spin relaxation and soft X-ray scattering, we observe correlated dynamics at the critical temperature and the emergence of static long-range order at low temperatures, which is compatible with theoretical predictions for dipolar-coupled XY spin systems. Furthermore, by modifying the sample design, we demonstrate the possibility to tune the collective magnetic behaviour in thermally active artificial spin systems with continuous degrees of freedom.
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Affiliation(s)
- Naëmi Leo
- Laboratory for Mesoscopic Systems, Department of Materials, ETH Zurich, 8093, Zurich, Switzerland.
- Laboratory for Multiscale Materials Experiments, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland.
| | - Stefan Holenstein
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland
- Physik-Institut der Universität Zürich, Winterthurerstrasse 190, 8057, Zurich, Switzerland
| | - Dominik Schildknecht
- Laboratory for Mesoscopic Systems, Department of Materials, ETH Zurich, 8093, Zurich, Switzerland
- Laboratory for Multiscale Materials Experiments, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland
- Condensed Matter Theory Group, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland
| | - Oles Sendetskyi
- Laboratory for Mesoscopic Systems, Department of Materials, ETH Zurich, 8093, Zurich, Switzerland
- Laboratory for Multiscale Materials Experiments, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland
| | - Hubertus Luetkens
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland
| | - Peter M Derlet
- Condensed Matter Theory Group, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland
| | - Valerio Scagnoli
- Laboratory for Mesoscopic Systems, Department of Materials, ETH Zurich, 8093, Zurich, Switzerland
- Laboratory for Multiscale Materials Experiments, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland
| | - Diane Lançon
- Laboratory for Mesoscopic Systems, Department of Materials, ETH Zurich, 8093, Zurich, Switzerland
- Laboratory for Multiscale Materials Experiments, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland
| | - José R L Mardegan
- Swiss Light Source, Paul Scherrer Institut, 5232, Villigen, Switzerland
| | - Thomas Prokscha
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland
| | - Andreas Suter
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland
| | - Zaher Salman
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland
| | - Stephen Lee
- School of Physics and Astronomy, SUPA, University of St. Andrews, St Andrews, KY16 9SS, UK
| | - Laura J Heyderman
- Laboratory for Mesoscopic Systems, Department of Materials, ETH Zurich, 8093, Zurich, Switzerland
- Laboratory for Multiscale Materials Experiments, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland
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31
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Flokstra MG, Stewart R, Satchell N, Burnell G, Luetkens H, Prokscha T, Suter A, Morenzoni E, Langridge S, Lee SL. Observation of Anomalous Meissner Screening in Cu/Nb and Cu/Nb/Co Thin Films. Phys Rev Lett 2018; 120:247001. [PMID: 29957008 DOI: 10.1103/physrevlett.120.247001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2018] [Indexed: 06/08/2023]
Abstract
We have observed the spatial distribution of magnetic flux in Nb, Cu/Nb, and Cu/Nb/Co thin films using muon-spin rotation. In an isolated 50-nm-thick Nb film, we find a weak flux expulsion (Meissner effect) which becomes significantly enhanced when adding an adjacent 40 nm layer of Cu. The added Cu layer exhibits a Meissner effect (due to induced superconducting pairs) and is at least as effective as the Nb to expel flux. These results are confirmed by theoretical calculations using the quasiclassical Green's function formalism. An unexpected further significant enhancement of the flux expulsion is observed when adding a thin (2.4 nm) ferromagnetic Co layer to the bottom side of the Nb. This observed cooperation between superconductivity and ferromagnetism, by an unknown mechanism, forms a key ingredient for developing superconducting spintronics.
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Affiliation(s)
- M G Flokstra
- School of Physics and Astronomy, SUPA, University of St. Andrews, St. Andrews KY16 9SS, United Kingdom
| | - R Stewart
- School of Physics and Astronomy, SUPA, University of St. Andrews, St. Andrews KY16 9SS, United Kingdom
| | - N Satchell
- ISIS, Rutherford Appleton Laboratory, Oxfordshire OX11 0QX, United Kingdom
| | - G Burnell
- School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, United Kingdom
| | - H Luetkens
- Labor für Myonspinspektroskopie, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - T Prokscha
- Labor für Myonspinspektroskopie, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - A Suter
- Labor für Myonspinspektroskopie, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - E Morenzoni
- Labor für Myonspinspektroskopie, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - S Langridge
- ISIS, Rutherford Appleton Laboratory, Oxfordshire OX11 0QX, United Kingdom
| | - S L Lee
- School of Physics and Astronomy, SUPA, University of St. Andrews, St. Andrews KY16 9SS, United Kingdom
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32
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Sibille R, Lhotel E, Ciomaga Hatnean M, Nilsen GJ, Ehlers G, Cervellino A, Ressouche E, Frontzek M, Zaharko O, Pomjakushin V, Stuhr U, Walker HC, Adroja DT, Luetkens H, Baines C, Amato A, Balakrishnan G, Fennell T, Kenzelmann M. Coulomb spin liquid in anion-disordered pyrochlore Tb 2Hf 2O 7. Nat Commun 2017; 8:892. [PMID: 29026077 PMCID: PMC5638941 DOI: 10.1038/s41467-017-00905-w] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Accepted: 08/03/2017] [Indexed: 11/14/2022] Open
Abstract
The charge ordered structure of ions and vacancies characterizing rare-earth pyrochlore oxides serves as a model for the study of geometrically frustrated magnetism. The organization of magnetic ions into networks of corner-sharing tetrahedra gives rise to highly correlated magnetic phases with strong fluctuations, including spin liquids and spin ices. It is an open question how these ground states governed by local rules are affected by disorder. Here we demonstrate in the pyrochlore Tb2Hf2O7, that the vicinity of the disordering transition towards a defective fluorite structure translates into a tunable density of anion Frenkel disorder while cations remain ordered. Quenched random crystal fields and disordered exchange interactions can therefore be introduced into otherwise perfect pyrochlore lattices of magnetic ions. We show that disorder can play a crucial role in preventing long-range magnetic order at low temperatures, and instead induces a strongly fluctuating Coulomb spin liquid with defect-induced frozen magnetic degrees of freedom. Experimental studies of frustrated spin systems such as pyrochlore magnetic oxides test our understanding of quantum many-body physics. Here the authors show experimentally that Tb2Hf2O7 may be a model material for investigating how structural disorder can stabilize a quantum spin liquid phase.
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Affiliation(s)
- Romain Sibille
- Laboratory for Scientific Developments and Novel Materials, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland. .,Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland.
| | - Elsa Lhotel
- Institut Néel, CNRS-Université Grenoble Alpes, 38042, Grenoble, France
| | | | - Gøran J Nilsen
- Institut Laue-Langevin, CS 20156, 38042, Grenoble, France.,ISIS Facility, STFC Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX, UK
| | - Georg Ehlers
- Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Antonio Cervellino
- Swiss Light Source, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland
| | - Eric Ressouche
- Université Grenoble Alpes, CEA INAC, MEM, 38000, Grenoble, France
| | - Matthias Frontzek
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland.,Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Oksana Zaharko
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland
| | - Vladimir Pomjakushin
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland
| | - Uwe Stuhr
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland
| | - Helen C Walker
- ISIS Facility, STFC Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX, UK
| | - Devashibhai T Adroja
- ISIS Facility, STFC Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX, UK
| | - Hubertus Luetkens
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland
| | - Chris Baines
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland
| | - Alex Amato
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland
| | | | - Tom Fennell
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland
| | - Michel Kenzelmann
- Laboratory for Scientific Developments and Novel Materials, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland.,Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland
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33
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Amato A, Luetkens H, Sedlak K, Stoykov A, Scheuermann R, Elender M, Raselli A, Graf D. The new versatile general purpose surface-muon instrument (GPS) based on silicon photomultipliers for μSR measurements on a continuous-wave beam. Rev Sci Instrum 2017; 88:093301. [PMID: 28964216 DOI: 10.1063/1.4986045] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Accepted: 08/16/2017] [Indexed: 06/07/2023]
Abstract
We report on the design and commissioning of a new spectrometer for muon-spin relaxation/rotation studies installed at the Swiss Muon Source (SμS) of the Paul Scherrer Institute (PSI, Switzerland). This new instrument is essentially a new design and replaces the old general-purpose surface-muon (GPS) instrument that has been for long the workhorse of the μSR user facility at PSI. By making use of muon and positron detectors made of plastic scintillators read out by silicon photomultipliers, a time resolution of the complete instrument of about 160 ps (standard deviation) could be achieved. In addition, the absence of light guides, which are needed in traditionally built μSR instrument to deliver the scintillation light to photomultiplier tubes located outside magnetic fields applied, allowed us to design a compact instrument with a detector set covering an increased solid angle compared with the old GPS.
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Affiliation(s)
- A Amato
- Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - H Luetkens
- Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - K Sedlak
- Swiss Plasma Center, Ecole Polytechnique Fédérale de Lausanne, 5232 Villigen PSI, Switzerland
| | - A Stoykov
- Laboratory for Particle Physics, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - R Scheuermann
- Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - M Elender
- Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - A Raselli
- Laboratory for Scientific Developments and Novel Materials, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - D Graf
- Laboratory for Scientific Developments and Novel Materials, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
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34
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Al Ma'Mari F, Rogers M, Alghamdi S, Moorsom T, Lee S, Prokscha T, Luetkens H, Valvidares M, Teobaldi G, Flokstra M, Stewart R, Gargiani P, Ali M, Burnell G, Hickey BJ, Cespedes O. Emergent magnetism at transition-metal-nanocarbon interfaces. Proc Natl Acad Sci U S A 2017; 114:5583-5588. [PMID: 28507160 PMCID: PMC5465901 DOI: 10.1073/pnas.1620216114] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Charge transfer at metallo-molecular interfaces may be used to design multifunctional hybrids with an emergent magnetization that may offer an eco-friendly and tunable alternative to conventional magnets and devices. Here, we investigate the origin of the magnetism arising at these interfaces by using different techniques to probe 3d and 5d metal films such as Sc, Mn, Cu, and Pt in contact with fullerenes and rf-sputtered carbon layers. These systems exhibit small anisotropy and coercivity together with a high Curie point. Low-energy muon spin spectroscopy in Cu and Sc-C60 multilayers show a quick spin depolarization and oscillations attributed to nonuniform local magnetic fields close to the metallo-carbon interface. The hybridization state of the carbon layers plays a crucial role, and we observe an increased magnetization as sp3 orbitals are annealed into sp2-π graphitic states in sputtered carbon/copper multilayers. X-ray magnetic circular dichroism (XMCD) measurements at the carbon K edge of C60 layers in contact with Sc films show spin polarization in the lowest unoccupied molecular orbital (LUMO) and higher π*-molecular levels, whereas the dichroism in the σ*-resonances is small or nonexistent. These results support the idea of an interaction mediated via charge transfer from the metal and dz-π hybridization. Thin-film carbon-based magnets may allow for the manipulation of spin ordering at metallic surfaces using electrooptical signals, with potential applications in computing, sensors, and other multifunctional magnetic devices.
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Affiliation(s)
- Fatma Al Ma'Mari
- School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, United Kingdom
- Department of Physics, Sultan Qaboos University, 123 Muscat, Oman
| | - Matthew Rogers
- School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, United Kingdom
| | - Shoug Alghamdi
- School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, United Kingdom
| | - Timothy Moorsom
- School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, United Kingdom
| | - Stephen Lee
- School of Physics and Astronomy, Scottish Universities Physics Alliance, University of St. Andrews, St. Andrews KY16 9SS, United Kingdom
| | - Thomas Prokscha
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, 5232 Villigen, Switzerland
| | - Hubertus Luetkens
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, 5232 Villigen, Switzerland
| | | | - Gilberto Teobaldi
- Stephenson Institute for Renewable Energy, Department of Chemistry, University of Liverpool, Liverpool L69 3BX, United Kingdom
- Beijing Computational Science Research Centre, Beijing 100193 China
| | - Machiel Flokstra
- School of Physics and Astronomy, Scottish Universities Physics Alliance, University of St. Andrews, St. Andrews KY16 9SS, United Kingdom
| | - Rhea Stewart
- School of Physics and Astronomy, Scottish Universities Physics Alliance, University of St. Andrews, St. Andrews KY16 9SS, United Kingdom
| | | | - Mannan Ali
- School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, United Kingdom
| | - Gavin Burnell
- School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, United Kingdom
| | - B J Hickey
- School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, United Kingdom
| | - Oscar Cespedes
- School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, United Kingdom;
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35
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Khasanov R, Amato A, Bonfà P, Guguchia Z, Luetkens H, Morenzoni E, De Renzi R, Zhigadlo ND. Magnetic states of MnP: muon-spin rotation studies. J Phys Condens Matter 2017; 29:164003. [PMID: 28323635 DOI: 10.1088/1361-648x/aa6391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Muon-spin rotation data collected at ambient pressure (p) and at p = 2.42 GPa in MnP were analyzed to check their consistency with various low- and high-pressure magnetic structures reported in the literature. Our analysis confirms that in MnP the low-temperature and low-pressure helimagnetic phase is characterised by an increased value of the average magnetic moment compared to the high-temperature ferromagnetic phase. An elliptical double-helical structure with a propagation vector [Formula: see text], an a-axis moment elongated by approximately 18% and an additional tilt of the rotation plane towards c-direction by [Formula: see text]-8° leads to a good agreement between the theory and the experiment. The analysis of the high-pressure μSR data reveals that the new magnetic order appearing for pressures exceeding 1.5 GPa can not be described by keeping the propagation vector [Formula: see text]. Even the extreme case-decoupling the double-helical structure into four individual helices-remains inconsistent with the experiment. It is shown that the high-pressure magnetic phase which is a precursor of superconductivity is an incommensurate helical state with [Formula: see text].
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Affiliation(s)
- R Khasanov
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
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36
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Peschke S, Weippert V, Senyshyn A, Mühlbauer MJ, Janka O, Pöttgen R, Holenstein S, Luetkens H, Johrendt D. Flux Synthesis, Crystal Structures, and Magnetic Ordering of the Rare-Earth Chromium(II) Oxyselenides RE 2CrSe 2O 2 (RE = La-Nd). Inorg Chem 2017; 56:2241-2247. [PMID: 28182417 DOI: 10.1021/acs.inorgchem.6b02895] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The rare-earth chromium(II) oxyselenides RE2CrSe2O2 (RE = La-Nd) were synthesized in eutectic NaI/KI fluxes, and their crystal structures were determined by single-crystal and powder X-ray diffraction (Pb2HgCl2O2-type, C2/m, Z = 2). The magnetic structure of La2CrSe2O2 was solved and refined from neutron powder diffraction data. Main building blocks are chains of edge-sharing CrSe4O2 octahedra linked together by two edge-sharing ORE3Cr tetrahedra forming infinite ribbons. The Jahn-Teller instability of divalent Cr2+ (d4) leads to structural phase transitions at 200 and 130 K in La2CrSe2O2 and Ce2CrSe2O2, respectively. RE2CrSe2O2 are Curie-Weiss paramagnetic above TN ≈ 14-17 K. Neutron powder diffraction reveals anti-ferromagnetic ordering of the Cr2+ moments in La2CrSe2O2 below TN = 12.7(3) K with an average ordered moment of 3.40(4) μB/Cr2+ at 4 K, which was confirmed by muon spin rotation experiments.
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Affiliation(s)
- Simon Peschke
- Department Chemie, Ludwig-Maximilians-Universität München , D-81377 München, Germany
| | - Valentin Weippert
- Department Chemie, Ludwig-Maximilians-Universität München , D-81377 München, Germany
| | - Anatoliy Senyshyn
- Heinz Maier-Leibnitz Zentrum, Technische Universität München , Lichtenbergstrasse 1, D-85747 Garching, Germany
| | - Martin Johann Mühlbauer
- Heinz Maier-Leibnitz Zentrum, Technische Universität München , Lichtenbergstrasse 1, D-85747 Garching, Germany.,Helmholtz Institute Ulm for Electrochemical Energy Storage , Helmholtzstrasse 11, 89081 Ulm, Germany.,Institut for Applied Materials, Karlsruhe Institute of Technology , Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Oliver Janka
- Institut für Anorganische und Analytische Chemie, Universität Münster , Corrensstrasse 30, D-48149 Münster, Germany
| | - Rainer Pöttgen
- Institut für Anorganische und Analytische Chemie, Universität Münster , Corrensstrasse 30, D-48149 Münster, Germany
| | - Stefan Holenstein
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute , CH-5232 Villigen PSI, Switzerland.,Physik-Institut der Universität Zürich , Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
| | - Hubertus Luetkens
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute , CH-5232 Villigen PSI, Switzerland
| | - Dirk Johrendt
- Department Chemie, Ludwig-Maximilians-Universität München , D-81377 München, Germany
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37
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Ding C, Guo S, Zhao Y, Man H, Fu L, Gu Y, Wang Z, Liu L, Frandsen BA, Cheung S, Uemura YJ, Goko T, Luetkens H, Morenzoni E, Zhao Y, Ning FL. The synthesis and characterization of 1 1 1 1 type diluted ferromagnetic semiconductor (La(1-x)Ca(x))(Zn(1-x) Mn(x))AsO. J Phys Condens Matter 2016; 28:026003. [PMID: 26679223 DOI: 10.1088/0953-8984/28/2/026003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We report the synthesis and characterization of a bulk form diluted magnetic semiconductor, (La(1-x)Ca(x))(Zn(1-y) Mn(y))AsO, with a layered crystal structure isostructural to that of the 1 1 1 1 type Fe-based high-temperature superconductor LaFeAsO and the antiferromagnetic LaMnAsO. With Ca and Mn codoping into LaZnAsO, the ferromagnetic ordering occurs below the Curie temperature T(c) ∼30 K. Taking advantage of the decoupled charge and spin doping, we investigate the influence of carrier concentration on the ferromagnetic ordering state. For a fixed Mn concentration of 10%, T(c) increases from 24 K to 30 K when the Ca concentration increases from 5% to 10%. Further increase of Ca concentration reduces both the coercive field and saturation moment. Muon spin relaxation measurements confirm the ferromagnetically ordered state, and clearly demonstrate that La(1-x)Ca(x))(Zn(1-y) Mn(y))AsO shares a common mechanism for the ferromagnetic exchange interaction with (Ga,Mn)As. Neutron scattering measurements show no structural transition in (La(0.90)Ca(0.10))(Zn(0.90)Mn(0.10)) AsO below 300 K.
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Affiliation(s)
- Cui Ding
- Department of Physics, Zhejiang University, Hangzhou 310027, People's Republic of China. Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, People's Republic of China
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38
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Guguchia Z, Amato A, Kang J, Luetkens H, Biswas PK, Prando G, von Rohr F, Bukowski Z, Shengelaya A, Keller H, Morenzoni E, Fernandes RM, Khasanov R. Direct evidence for a pressure-induced nodal superconducting gap in the Ba0.65Rb0.35Fe2As2 superconductor. Nat Commun 2015; 6:8863. [PMID: 26548650 PMCID: PMC4667685 DOI: 10.1038/ncomms9863] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2015] [Accepted: 10/12/2015] [Indexed: 11/09/2022] Open
Abstract
The superconducting gap structure in iron-based high-temperature superconductors (Fe-HTSs) is non-universal. In contrast to other unconventional superconductors, in the Fe-HTSs both d-wave and extended s-wave pairing symmetries are close in energy. Probing the proximity between these very different superconducting states and identifying experimental parameters that can tune them is of central interest. Here we report high-pressure muon spin rotation experiments on the temperature-dependent magnetic penetration depth in the optimally doped nodeless s-wave Fe-HTS Ba0.65Rb0.35Fe2As2. Upon pressure, a strong decrease of the penetration depth in the zero-temperature limit is observed, while the superconducting transition temperature remains nearly constant. More importantly, the low-temperature behaviour of the inverse-squared magnetic penetration depth, which is a direct measure of the superfluid density, changes qualitatively from an exponential saturation at zero pressure to a linear-in-temperature behaviour at higher pressures, indicating that hydrostatic pressure promotes the appearance of nodes in the superconducting gap.
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Affiliation(s)
- Z Guguchia
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - A Amato
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - J Kang
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - H Luetkens
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - P K Biswas
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - G Prando
- Leibniz-Institut für Festkörper- und Werkstoffforschung (IFW) Dresden, D-01171 Dresden, Germany
| | - F von Rohr
- Physik-Institut der Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
| | - Z Bukowski
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, 50-422 Wroclaw, Poland
| | - A Shengelaya
- Department of Physics, Tbilisi State University, Chavchavadze 3, GE-0128 Tbilisi, Georgia
| | - H Keller
- Physik-Institut der Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
| | - E Morenzoni
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - Rafael M Fernandes
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - R Khasanov
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
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39
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Anghinolfi L, Luetkens H, Perron J, Flokstra MG, Sendetskyi O, Suter A, Prokscha T, Derlet PM, Lee SL, Heyderman LJ. Thermodynamic phase transitions in a frustrated magnetic metamaterial. Nat Commun 2015; 6:8278. [PMID: 26387444 PMCID: PMC4595626 DOI: 10.1038/ncomms9278] [Citation(s) in RCA: 93] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2015] [Accepted: 08/05/2015] [Indexed: 11/09/2022] Open
Abstract
Materials with interacting magnetic degrees of freedom display a rich variety of magnetic behaviour that can lead to novel collective equilibrium and out-of-equilibrium phenomena. In equilibrium, thermodynamic phases appear with the associated phase transitions providing a characteristic signature of the underlying collective behaviour. Here we create a thermally active artificial kagome spin ice that is made up of a large array of dipolar interacting nanomagnets and undergoes phase transitions predicted by microscopic theory. We use low energy muon spectroscopy to probe the dynamic behaviour of the interacting nanomagnets and observe peaks in the muon relaxation rate that can be identified with the critical temperatures of the predicted phase transitions. This provides experimental evidence that a frustrated magnetic metamaterial can be engineered to admit thermodynamic phases.
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Affiliation(s)
- L Anghinolfi
- Laboratory for Mesoscopic Systems, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland.,Laboratory for Micro- and Nanotechnology, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland.,Laboratory for Neutron Scattering, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - H Luetkens
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - J Perron
- Laboratory for Mesoscopic Systems, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland.,Laboratory for Micro- and Nanotechnology, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland.,Sorbonne Universités, UPMC Univ Paris 06, UMR 7614, LCPMR, 75005 Paris, France.,CNRS, UMR 7614, LCPMR, 75005 Paris, France
| | - M G Flokstra
- School of Physics and Astronomy, SUPA, University of St. Andrews, St. Andrews KY16 9SS, UK
| | - O Sendetskyi
- Laboratory for Mesoscopic Systems, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland.,Laboratory for Micro- and Nanotechnology, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - A Suter
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - T Prokscha
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - P M Derlet
- Condensed Matter Theory Group, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - S L Lee
- School of Physics and Astronomy, SUPA, University of St. Andrews, St. Andrews KY16 9SS, UK
| | - L J Heyderman
- Laboratory for Mesoscopic Systems, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland.,Laboratory for Micro- and Nanotechnology, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
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40
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Khasanov R, Guguchia Z, Eremin I, Luetkens H, Amato A, Biswas PK, Rüegg C, Susner MA, Sefat AS, Zhigadlo ND, Morenzoni E. Pressure-induced electronic phase separation of magnetism and superconductivity in CrAs. Sci Rep 2015; 5:13788. [PMID: 26346548 PMCID: PMC4561900 DOI: 10.1038/srep13788] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Accepted: 07/28/2015] [Indexed: 11/30/2022] Open
Abstract
The recent discovery of pressure (p) induced superconductivity in the binary helimagnet CrAs has raised questions on how superconductivity emerges from the magnetic state and on the mechanism of the superconducting pairing. In the present work the suppression of magnetism and the occurrence of superconductivity in CrAs were studied by means of muon spin rotation. The magnetism remains bulk up to p 3.5 kbar while its volume fraction gradually decreases with increasing pressure until it vanishes at p 7 kbar. At 3.5 kbar superconductivity abruptly appears with its maximum Tc 1.2 K which decreases upon increasing the pressure. In the intermediate pressure region (3.5 p 7 kbar) the superconducting and the magnetic volume fractions are spatially phase separated and compete for phase volume. Our results indicate that the less conductive magnetic phase provides additional carriers (doping) to the superconducting parts of the CrAs sample thus leading to an increase of the transition temperature (Tc) and of the superfluid density (ρs). A scaling of ρs with as well as the phase separation between magnetism and superconductivity point to a conventional mechanism of the Cooper-pairing in CrAs.
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Affiliation(s)
- Rustem Khasanov
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Zurab Guguchia
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Ilya Eremin
- Institut für Theoretische Physik III, Ruhr-Universität Bochum, D-44801 Bochum, Germany.,Kazan (Volga region) Federal University, 420008 Kazan, Russia
| | - Hubertus Luetkens
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Alex Amato
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Pabitra K Biswas
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Christian Rüegg
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland.,Department of Quantum Matter Physics, University of Geneva, CH-1211 Geneva, Switzerland
| | - Michael A Susner
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6114, USA
| | - Athena S Sefat
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6114, USA
| | | | - Elvezio Morenzoni
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
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41
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Ma’Mari FA, Moorsom T, Teobaldi G, Deacon W, Prokscha T, Luetkens H, Lee S, Sterbinsky GE, Arena DA, MacLaren DA, Flokstra M, Ali M, Wheeler MC, Burnell G, Hickey BJ, Cespedes O. Beating the Stoner criterion using molecular interfaces. Nature 2015; 524:69-73. [DOI: 10.1038/nature14621] [Citation(s) in RCA: 121] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2014] [Accepted: 05/22/2015] [Indexed: 11/09/2022]
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42
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Tietze T, Audehm P, Chen YC, Schütz G, Straumal BB, Protasova SG, Mazilkin AA, Straumal PB, Prokscha T, Luetkens H, Salman Z, Suter A, Baretzky B, Fink K, Wenzel W, Danilov D, Goering E. Interfacial dominated ferromagnetism in nanograined ZnO: a μSR and DFT study. Sci Rep 2015; 5:8871. [PMID: 25747456 PMCID: PMC4352909 DOI: 10.1038/srep08871] [Citation(s) in RCA: 92] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2014] [Accepted: 02/06/2015] [Indexed: 11/09/2022] Open
Abstract
Diamagnetic oxides can, under certain conditions, become ferromagnetic at room temperature and therefore are promising candidates for future material in spintronic devices. Contrary to early predictions, doping ZnO with uniformly distributed magnetic ions is not essential to obtain ferromagnetic samples. Instead, the nanostructure seems to play the key role, as room temperature ferromagnetism was also found in nanograined, undoped ZnO. However, the origin of room temperature ferromagnetism in primarily non-magnetic oxides like ZnO is still unexplained and a controversial subject within the scientific community. Using low energy muon spin relaxation in combination with SQUID and TEM techniques, we demonstrate that the magnetic volume fraction is strongly related to the sample volume fraction occupied by grain boundaries. With molecular dynamics and density functional theory we find ferromagnetic coupled electron states in ZnO grain boundaries. Our results provide evidence and a microscopic model for room temperature ferromagnetism in oxides.
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Affiliation(s)
- Thomas Tietze
- Max-Planck-Institute for Intelligent Systems, Heisenbergstr. 3, D-70569 Stuttgart, Germany
| | - Patrick Audehm
- Max-Planck-Institute for Intelligent Systems, Heisenbergstr. 3, D-70569 Stuttgart, Germany
| | - Yu-Chun Chen
- Max-Planck-Institute for Intelligent Systems, Heisenbergstr. 3, D-70569 Stuttgart, Germany
| | - Gisela Schütz
- Max-Planck-Institute for Intelligent Systems, Heisenbergstr. 3, D-70569 Stuttgart, Germany
| | - Boris B Straumal
- 1] Moscow Institute of Physics and Technology (State University), Institutskii per. 9, 141700 Dolgoprudny, Russia [2] Institute of Solid State Physics, Russian Academy of Sciences, Ac. Ossipyan str. 2, 142432 Chernogolovka, Russia [3] National Research Technological University "MISiS", Leninsky prosp. 4, 119991 Moscow, Russia [4] Karlsruhe Institute of Technology, Institute of Nanotechnology, Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
| | - Svetlana G Protasova
- Institute of Solid State Physics, Russian Academy of Sciences, Ac. Ossipyan str. 2, 142432 Chernogolovka, Russia
| | - Andrey A Mazilkin
- 1] Institute of Solid State Physics, Russian Academy of Sciences, Ac. Ossipyan str. 2, 142432 Chernogolovka, Russia [2] Karlsruhe Institute of Technology, Institute of Nanotechnology, Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
| | - Petr B Straumal
- 1] National Research Technological University "MISiS", Leninsky prosp. 4, 119991 Moscow, Russia [2] A.A. Baikov Institute of Metallurgy and Materials Science RAS, 117991 Moscow, Russia
| | - Thomas Prokscha
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, CH-5232 Villigen, Switzerland
| | - Hubertus Luetkens
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, CH-5232 Villigen, Switzerland
| | - Zaher Salman
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, CH-5232 Villigen, Switzerland
| | - Andreas Suter
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, CH-5232 Villigen, Switzerland
| | - Brigitte Baretzky
- Karlsruhe Institute of Technology, Institute of Nanotechnology, Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
| | - Karin Fink
- Karlsruhe Institute of Technology, Institute of Nanotechnology, Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
| | - Wolfgang Wenzel
- Karlsruhe Institute of Technology, Institute of Nanotechnology, Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
| | - Denis Danilov
- Karlsruhe Institute of Technology, Institute of Nanotechnology, Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
| | - Eberhard Goering
- Max-Planck-Institute for Intelligent Systems, Heisenbergstr. 3, D-70569 Stuttgart, Germany
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43
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Saadaoui H, Salman Z, Luetkens H, Prokscha T, Suter A, MacFarlane WA, Jiang Y, Jin K, Greene RL, Morenzoni E, Kiefl RF. The phase diagram of electron-doped La(2-x)Ce(x)CuO(4-δ). Nat Commun 2015; 6:6041. [PMID: 25608106 DOI: 10.1038/ncomms7041] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2014] [Accepted: 12/05/2014] [Indexed: 11/09/2022] Open
Abstract
Superconductivity is a striking example of a quantum phenomenon in which electrons move coherently over macroscopic distances without scattering. The high-temperature superconducting oxides (cuprates) are the most studied class of superconductors, composed of two-dimensional CuO2 planes separated by other layers that control the electron concentration in the planes. A key unresolved issue in cuprates is the relationship between superconductivity and magnetism. Here we report a sharp phase boundary of static three-dimensional magnetic order in the electron-doped superconductor La(2-x)Ce(x)CuO(4-δ), where small changes in doping or depth from the surface switch the material from superconducting to magnetic. Using low-energy spin-polarized muons, we find that static magnetism disappears close to where superconductivity begins and well below the doping level at which dramatic changes in the transport properties are reported. These results indicate a higher degree of symmetry between the electron and hole-doped cuprates than previously thought.
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Affiliation(s)
- H Saadaoui
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - Z Salman
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - H Luetkens
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - T Prokscha
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - A Suter
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - W A MacFarlane
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1
| | - Y Jiang
- Center for Nanophysics and Advanced Materials, University of Maryland, College Park, Maryland 20742, USA
| | - K Jin
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - R L Greene
- Center for Nanophysics and Advanced Materials, University of Maryland, College Park, Maryland 20742, USA
| | - E Morenzoni
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - R F Kiefl
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1
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44
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Pachmayr U, Nitsche F, Luetkens H, Kamusella S, Brückner F, Sarkar R, Klauss H, Johrendt D. Koexistenz von 3d‐Ferromagnetismus und Supraleitung in [(Li
1−
x
Fe
x
)OH](Fe
1−
y
Li
y
)Se. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201407756] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ursula Pachmayr
- Department Chemie, Ludwig‐Maximilians‐Universität München, Butenandtstraße 5–13 (Haus D), 81377 München (Deutschland)
| | - Fabian Nitsche
- Department Chemie, Ludwig‐Maximilians‐Universität München, Butenandtstraße 5–13 (Haus D), 81377 München (Deutschland)
| | | | - Sirko Kamusella
- Institut für Festkörperphysik, Technische Universität Dresden, 01062 Dresden (Deutschland)
| | - Felix Brückner
- Institut für Festkörperphysik, Technische Universität Dresden, 01062 Dresden (Deutschland)
| | - Rajib Sarkar
- Institut für Festkörperphysik, Technische Universität Dresden, 01062 Dresden (Deutschland)
| | - Hans‐Henning Klauss
- Institut für Festkörperphysik, Technische Universität Dresden, 01062 Dresden (Deutschland)
| | - Dirk Johrendt
- Department Chemie, Ludwig‐Maximilians‐Universität München, Butenandtstraße 5–13 (Haus D), 81377 München (Deutschland)
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45
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Dally R, Hogan T, Amato A, Luetkens H, Baines C, Rodriguez-Rivera J, Graf MJ, Wilson SD. Short-range correlations in the magnetic ground state of Na₄Ir₃O₈. Phys Rev Lett 2014; 113:247601. [PMID: 25541804 DOI: 10.1103/physrevlett.113.247601] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2014] [Indexed: 06/04/2023]
Abstract
The magnetic ground state of the J(eff)=1/2 hyperkagome lattice in Na₄Ir₃O₈ is explored via combined bulk magnetization, muon spin relaxation, and neutron scattering measurements. A short-range, frozen state comprised of quasistatic moments develops below a characteristic temperature of T(F)=6 K, revealing an inhomogeneous distribution of spins occupying the entirety of the sample volume. Quasistatic, short-range spin correlations persist until at least 20 mK and differ substantially from the nominally dynamic response of a quantum spin liquid. Our data demonstrate that an inhomogeneous magnetic ground state arises in Na₄Ir₃O₈ driven either by disorder inherent to the creation of the hyperkagome lattice itself or stabilized via quantum fluctuations.
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Affiliation(s)
- Rebecca Dally
- Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA
| | - Tom Hogan
- Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA
| | - Alex Amato
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - Hubertus Luetkens
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - Chris Baines
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - Jose Rodriguez-Rivera
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - Michael J Graf
- Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA
| | - Stephen D Wilson
- Department of Materials, University of California, Santa Barbara, California 93106, USA
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46
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Pachmayr U, Nitsche F, Luetkens H, Kamusella S, Brückner F, Sarkar R, Klauss H, Johrendt D. Coexistence of 3d‐Ferromagnetism and Superconductivity in [(Li
1−
x
Fe
x
)OH](Fe
1−
y
Li
y
)Se. Angew Chem Int Ed Engl 2014; 54:293-7. [DOI: 10.1002/anie.201407756] [Citation(s) in RCA: 109] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2014] [Revised: 08/25/2014] [Indexed: 11/06/2022]
Affiliation(s)
- Ursula Pachmayr
- Department Chemie, Ludwig‐Maximilians‐Universität München, Butenandtstrasse 5–13 (Haus D), 81377 München (Germany)
| | - Fabian Nitsche
- Department Chemie, Ludwig‐Maximilians‐Universität München, Butenandtstrasse 5–13 (Haus D), 81377 München (Germany)
| | | | - Sirko Kamusella
- Institut für Festkörperphysik, Technische Universität Dresden, 01062 Dresden (Germany)
| | - Felix Brückner
- Institut für Festkörperphysik, Technische Universität Dresden, 01062 Dresden (Germany)
| | - Rajib Sarkar
- Institut für Festkörperphysik, Technische Universität Dresden, 01062 Dresden (Germany)
| | - Hans‐Henning Klauss
- Institut für Festkörperphysik, Technische Universität Dresden, 01062 Dresden (Germany)
| | - Dirk Johrendt
- Department Chemie, Ludwig‐Maximilians‐Universität München, Butenandtstrasse 5–13 (Haus D), 81377 München (Germany)
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47
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Krzton-Maziopa A, Guguchia Z, Pomjakushina E, Pomjakushin V, Khasanov R, Luetkens H, Biswas PK, Amato A, Keller H, Conder K. Superconductivity in a new layered bismuth oxyselenide: LaO(0.5)F(0.5)BiSe₂. J Phys Condens Matter 2014; 26:215702. [PMID: 24805837 DOI: 10.1088/0953-8984/26/21/215702] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We report superconductivity at T(c) ≈ 2.6 K in a new layered bismuth oxyselenide LaO(0.5)F(0.5)BiSe2 with the ZrCuSiAs-type structure composed of alternating superconducting BiSe2 and blocking LaO layers. The superconducting properties of LaO(0.5)F(0.5)BiSe2 were investigated by means of dc magnetization, resistivity and muon-spin rotation experiments, revealing the appearance of bulk superconductivity with a rather large superconducting volume fraction of ≈ 70% at 1.8 K.
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Affiliation(s)
- A Krzton-Maziopa
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
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48
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Maeter H, Zvyagin AA, Luetkens H, Pascua G, Shermadini Z, Saint-Martin R, Revcolevschi A, Hess C, Büchner B, Klauss HH. Low temperature ballistic spin transport in the S = 1/2 antiferromagnetic Heisenberg chain compound SrCuO2. J Phys Condens Matter 2013; 25:365601. [PMID: 23924574 DOI: 10.1088/0953-8984/25/36/365601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We report zero and longitudinal magnetic field muon spin relaxation (μSR) measurements of the spin S = 1/2 antiferromagnetic Heisenberg chain material SrCuO2. We find that in a weak applied magnetic field B0 the spin-lattice relaxation rate λ follows a power law λ is proportional to B(0)(-n) with n = 0.9(3). This result is temperature independent for 5 K ≤ T ≤ 300 K. Within conformal field theory and using the Müller ansatz we conclude ballistic spin transport in SrCuO2.
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Affiliation(s)
- H Maeter
- Institute for Solid State Physics, TU Dresden, D-01069 Dresden, Germany
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49
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White JS, Bator M, Hu Y, Luetkens H, Stahn J, Capelli S, Das S, Döbeli M, Lippert T, Malik VK, Martynczuk J, Wokaun A, Kenzelmann M, Niedermayer C, Schneider CW. Strain-induced ferromagnetism in antiferromagnetic LuMnO3 thin films. Phys Rev Lett 2013; 111:037201. [PMID: 23909354 DOI: 10.1103/physrevlett.111.037201] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2012] [Revised: 06/14/2013] [Indexed: 06/02/2023]
Abstract
Single phase and strained LuMnO(3) thin films are discovered to display coexisting ferromagnetic and antiferromagnetic orders. A large moment ferromagnetism (≈1μ(B)), which is absent in bulk samples, is shown to display a magnetic moment distribution that is peaked at the highly strained substrate-film interface. We further show that the strain-induced ferromagnetism and the antiferromagnetic order are coupled via an exchange field, therefore demonstrating strained rare-earth manganite thin films as promising candidate systems for new multifunctional devices.
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Affiliation(s)
- J S White
- Laboratory for Neutron Scattering, Paul Scherrer Institut, CH-5232 Villigen, Switzerland
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50
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Biswas PK, Krzton-Maziopa A, Khasanov R, Luetkens H, Pomjakushina E, Conder K, Amato A. Two-dimensional superfluid density in an alkali metal-organic solvent intercalated iron selenide superconductor Li(C5H5N)0.2Fe2Se2. Phys Rev Lett 2013; 110:137003. [PMID: 23581361 DOI: 10.1103/physrevlett.110.137003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2012] [Revised: 12/30/2012] [Indexed: 06/02/2023]
Abstract
We report the low-temperature electronic and magnetic properties of the alkali metal-organic solvent intercalated iron selenide superconductor Li(C5H5N)0.2Fe2Se2 using muon-spin-spectroscopy measurements. The zero-field muon spin relaxation (μSR) results indicate that nearly half of the sample is magnetically ordered and spatially phase separated from the superconducting region. The transverse-field μSR results reveal that the superfluid density of Li(C5H5N)0.2Fe2Se2 is two dimensional in nature. The temperature dependence of the penetration depth λ(T) can be explained using a two-gap s-wave model. This implies that, despite the 2D nature of the superfluid density, the symmetry of the superconducting gap remains unaltered to the parent compound FeSe.
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Affiliation(s)
- P K Biswas
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland.
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