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Chen K, Luo C, Zhao Y, Baudelet F, Maurya A, Thamizhavel A, Rößler UK, Makarov D, Radu F. Evidence of the Anomalous Fluctuating Magnetic State by Pressure-Driven 4f Valence Change in EuNiGe 3. J Phys Chem Lett 2023; 14:1000-1006. [PMID: 36693119 PMCID: PMC9900636 DOI: 10.1021/acs.jpclett.2c03569] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Accepted: 01/19/2023] [Indexed: 06/17/2023]
Abstract
In rare-earth compounds with valence fluctuation, the proximity of the 4f level to the Fermi energy leads to instabilities of the charge configuration and the magnetic moment. Here, we provide direct experimental evidence for an induced magnetic polarization of the Eu3+ atomic shell with J = 0, due to intra-atomic exchange and spin-orbital coupling interactions with the Eu2+ atomic shell. By applying external pressure, a transition from antiferromagnetic to a fluctuating behavior in EuNiGe3 single crystals is probed. Magnetic polarization is observed for both valence states of Eu2+ and Eu3+ across the entire pressure range. The anomalous magnetism is discussed in terms of a homogeneous intermediate valence state where frustrated Dzyaloshinskii-Moriya couplings are enhanced by the onset of spin-orbital interaction and engender a chiral spin-liquid-like precursor.
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Affiliation(s)
- K. Chen
- National
Synchrotron Radiation Laboratory, University
of Science and Technology of China, Hefei 230026, Anhui, China
| | - C. Luo
- Helmholtz-Zentrum
Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, 12489 Berlin, Germany
| | - Y. Zhao
- Center
for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai 201203, China
| | - F. Baudelet
- Synchrotron
SOLEIL, L’Orme des Merisiers, Saint-Aubin-BP48, 91192 GIF-sur-Yvette, France
| | - A. Maurya
- Department
of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Colaba, Mumbai 400005, India
| | - A. Thamizhavel
- Department
of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Colaba, Mumbai 400005, India
| | - U. K. Rößler
- Leibniz-Institut
für Festkörper- und Werkstoffforschung Dresden e. V.
(IFW Dresden), 01069 Dresden, Germany
| | - D. Makarov
- Helmholtz-Zentrum
Dresden-Rossendorf e.V., Institute of Ion Beam Physics and Materials
Research, 01328 Dresden, Germany
| | - F. Radu
- Helmholtz-Zentrum
Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, 12489 Berlin, Germany
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2
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Temperature-induced valence transition in EuNi2(Si1–Ge )2 investigated by high-energy resolution fluorescence detection X-ray absorption spectroscopy. Radiat Phys Chem Oxf Engl 1993 2020. [DOI: 10.1016/j.radphyschem.2019.02.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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3
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Haque Z, Thakur GS, Parthasarathy R, Gerke B, Block T, Heletta L, Pöttgen R, Joshi AG, Selvan GK, Arumugam S, Gupta LC, Ganguli AK. Unusual Mixed Valence of Eu in Two Materials-EuSr 2Bi 2S 4F 4 and Eu 2SrBi 2S 4F 4: Mössbauer and X-ray Photoemission Spectroscopy Investigations. Inorg Chem 2017; 56:3182-3189. [PMID: 28245123 DOI: 10.1021/acs.inorgchem.6b01926] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We have synthesized two new Eu-based compounds, EuSr2Bi2S4F4 and Eu2SrBi2S4F4, which are derivatives of Eu3Bi2S4F4, an intrinsic superconductor with Tc = 1.5 K. They belong to a tetragonal structure (SG: I4/mmm, Z = 2), similar to the parent compound Eu3Bi2S4F4. Our structural and 151Eu Mössbauer spectroscopy studies show that, in EuSr2Bi2S4F4, Eu-atoms exclusively occupy the crystallographic 2a-sites. In Eu2SrBi2S4F4, 2a-sites are fully occupied by Eu-atoms and the other half of Eu-atoms and Sr-atoms together fully occupy 4e-sites in a statistical distribution. In both compounds Eu atoms occupying the crystallographic 2a-sites are in a homogeneous mixed valent state ∼2.6-2.7. From our magnetization studies in an applied H ≤ 9 T, we infer that the valence of Eu-atoms in Eu2SrBi2S4F4 at the 2a-sites exhibits a shift toward 2+. Our XPS studies corroborate the occurrence of valence fluctuations of Eu and after Ar-ion sputtering show evidence of enhanced population of Eu2+-states. Resistivity measurements, down to 2 K, suggest a semimetallic nature for both compounds.
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Affiliation(s)
- Zeba Haque
- Department of Chemistry, Indian Institute of Technology , New Delhi 110016, India
| | - Gohil Singh Thakur
- Department of Chemistry, Indian Institute of Technology , New Delhi 110016, India
| | | | - Birgit Gerke
- Institut für Anorganische und Analytische Chemie, Universität Münster , Corrensstrasse 30, D-48149 Münster, Germany
| | - Theresa Block
- Institut für Anorganische und Analytische Chemie, Universität Münster , Corrensstrasse 30, D-48149 Münster, Germany
| | - Lukas Heletta
- 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
| | - Amish G Joshi
- CSIR-National Physical Laboratory , Dr. K.S. Krishnan Road, New Delhi 110012, India
| | - Ganesan Kalai Selvan
- Centre for High Pressure Research, School of Physics, Bharathidasan University , Tiruchirapalli 620024, India
| | - Sonachalam Arumugam
- Centre for High Pressure Research, School of Physics, Bharathidasan University , Tiruchirapalli 620024, India
| | - Laxmi Chand Gupta
- Department of Chemistry, Indian Institute of Technology , New Delhi 110016, India
| | - Ashok Kumar Ganguli
- Department of Chemistry, Indian Institute of Technology , New Delhi 110016, India.,Institute of Nano Science & Technology , Habitat Centre, Mohali 160062, India
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4
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Inada T, Yamazaki T, Namba T, Asai S, Kobayashi T, Tamasaku K, Tanaka Y, Inubushi Y, Sawada K, Yabashi M, Ishikawa T, Matsuo A, Kawaguchi K, Kindo K, Nojiri H. Search for Two-Photon Interaction with Axionlike Particles Using High-Repetition Pulsed Magnets and Synchrotron X Rays. PHYSICAL REVIEW LETTERS 2017; 118:071803. [PMID: 28256869 DOI: 10.1103/physrevlett.118.071803] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2016] [Indexed: 06/06/2023]
Abstract
We report on new results of a search for a two-photon interaction with axionlike particles (ALPs). The experiment is carried out at a synchrotron radiation facility using a "light shining through a wall (LSW)" technique. For this purpose, we develop a novel pulsed-magnet system, composed of multiple racetrack magnets and a transportable power supply. It produces fields of about 10 T over 0.8 m with a high repetition rate of 0.2 Hz and yields a new method of probing a vacuum with high intensity fields. The data obtained with a total of 27 676 pulses provide a limit on the ALP-two-photon coupling constant that is more stringent by a factor of 5.2 compared to a previous x-ray LSW limit for the ALP mass ≲0.1 eV.
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Affiliation(s)
- T Inada
- International Center for Elementary Particle Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - T Yamazaki
- International Center for Elementary Particle Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - T Namba
- International Center for Elementary Particle Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - S Asai
- Department of Physics, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - T Kobayashi
- International Center for Elementary Particle Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - K Tamasaku
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
| | - Y Tanaka
- Graduate School of Material Science, University of Hyogo, Kamigori, Hyogo 678-1297, Japan
| | - Y Inubushi
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
| | - K Sawada
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
| | - M Yabashi
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
| | - T Ishikawa
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
| | - A Matsuo
- The Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, Chiba 277-8581, Japan
| | - K Kawaguchi
- The Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, Chiba 277-8581, Japan
| | - K Kindo
- The Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, Chiba 277-8581, Japan
| | - H Nojiri
- Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
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5
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Medvedev SA, Naumov P, Barkalov O, Shekhar C, Palasyuk T, Ksenofontov V, Wortmann G, Felser C. Structure and electrical resistivity of mixed-valent EuNi2P2 at high pressure. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2014; 26:335701. [PMID: 25056409 DOI: 10.1088/0953-8984/26/33/335701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The structural properties and electrical resistivity of homogeneous mixed-valent EuNi2P2 are studied at pressures up to 45 GPa. No structural phase transition is observed in the whole pressure range and the overall pressure behavior of the structural parameters is similar to that of related compounds in the collapsed tetragonal ThCr2Si2-type structure. Electrical resistivity measured up to 31 GPa at temperatures between 4 and 300 K exhibits continuous changes from the behavior typical for a mixed-valent Eu system to that of a normal metallic system at pressures above 20 GPa, indicating a transition of the strongly mixed-valent Eu atoms with a valence ~2.5 towards a pure trivalent state. No superconductivity was observed in the whole studied pressure-temperature range.
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Affiliation(s)
- S A Medvedev
- Max-Planck-Institute for Chemical Physics of Solids, D-01187 Dresden, Germany
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6
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Le Binh D, Ruck BJ, Natali F, Warring H, Trodahl HJ, Anton EM, Meyer C, Ranno L, Wilhelm F, Rogalev A. Europium nitride: a novel diluted magnetic semiconductor. PHYSICAL REVIEW LETTERS 2013; 111:167206. [PMID: 24182299 DOI: 10.1103/physrevlett.111.167206] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2013] [Indexed: 06/02/2023]
Abstract
Europium nitride is semiconducting and contains nonmagnetic Eu3+, but substoichiometric EuN has Eu in a mix of 2+ and 3+ charge states. We show that at Eu2+ concentrations near 15%-20% EuN is ferromagnetic with a Curie temperature as high as 120 K. The Eu3+ polarization follows that of the Eu2+, confirming that the ferromagnetism is intrinsic to the EuN which is, thus, a novel diluted magnetic semiconductor. Transport measurements shed light on the likely exchange mechanisms.
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Affiliation(s)
- Do Le Binh
- The MacDiarmid Institute for Advanced Materials and Nanotechnology, School of Chemical and Physical Sciences, Victoria University of Wellington, P.O. Box 600, Wellington 6140, New Zealand
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7
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Direct evidence for significant spin-polarization of EuS in Co/EuS multilayers at room temperature. Sci Rep 2013; 3:1333. [PMID: 23434820 PMCID: PMC3580319 DOI: 10.1038/srep01333] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2012] [Accepted: 01/22/2013] [Indexed: 12/02/2022] Open
Abstract
The new era of spintronics promises the development of nanodevices, where the electron spin will be used to store information and charge currents will be replaced by spin currents. For this, ferromagnetic semiconductors at room temperature are needed. We report on significant room-temperature spin polarization of EuS in Co/EuS multilayers recorded by x-ray magnetic circular dichroism (XMCD). The films were found to contain a mixture of divalent and trivalent europium, but only Eu++ is responsible for the ferromagnetic behavior of EuS. The magnetic XMCD signal of Eu at room temperature could unambiguously be assigned to magnetic ordering of EuS and was found to be only one order of magnitude smaller than that at 2.5 K. The room temperature magnetic moment of EuS is as large as the one of bulk ferromagnetic Ni. Our findings pave the path for fabrication of room–temperature spintronic devices using spin polarized EuS layers.
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8
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SARKAR SUMANTA, PETER SEBASTIANC. Single crystal growth of europium and ytterbium based intermetallic compounds using metal flux technique. J CHEM SCI 2013. [DOI: 10.1007/s12039-012-0335-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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9
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Wang H, Bryant C, LeGros M, Wang X, Cramer SP. Fluorescence-Detected X-ray Magnetic Circular Dichroism of Well-Defined MnII and NiII Doped in MgO Crystals: Credential Evaluation for Measurements on Biological Samples. J Phys Chem A 2012; 116:10082-9. [DOI: 10.1021/jp3027622] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hongxin Wang
- Department of Chemistry, University of California, Davis, California
95616, United States
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, United
States
| | - Craig Bryant
- Department of Chemistry, University of California, Davis, California
95616, United States
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, United
States
| | - M. LeGros
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, United
States
| | - Xin Wang
- Department of Chemistry, University of California, Davis, California
95616, United States
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, United
States
| | - S. P. Cramer
- Department of Chemistry, University of California, Davis, California
95616, United States
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, United
States
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10
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Das RK, Islam Z, Ruff JPC, Sawh RP, Weinstein R, Canfield PC, Kim JW, Lang JC. A novel approach for x-ray scattering experiments in magnetic fields utilizing trapped flux in type-II superconductors. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2012; 83:065103. [PMID: 22755658 DOI: 10.1063/1.4725523] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We introduce a novel approach to x-ray scattering studies in applied magnetic fields by exploiting vortices in superconductors. This method is based on trapping magnetic flux in a small disk-shaped superconductor (known as a trapped field magnet, TFM) with a single-crystal sample mounted on or at close proximity to its surface. This opens an unrestricted optical access to the sample and allows magnetic fields to be applied precisely along the x-ray momentum transfer, facilitating polarization-sensitive experiments that have been impractical or impossible to perform to date. The TFMs used in our study remain stable and provide practically uniform magnetic fields for days, which are sufficient for comprehensive x-ray diffraction experiments, specifically x-ray resonance exchange scattering (XRES) to study field-induced phenomena at a modern synchrotron source. The TFM instrument has been used in a "proof-of-principle" XRES study of a meta-magnetic phase in a rare-earth compound, TbNi(2)Ge(2), in order to demonstrate its potential.
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Affiliation(s)
- R K Das
- X-Ray Science Division, Advanced Photon Source, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, Illinois 60439, USA
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11
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Islam Z, Capatina D, Ruff JPC, Das RK, Trakhtenberg E, Nojiri H, Narumi Y, Welp U, Canfield PC. A single-solenoid pulsed-magnet system for single-crystal scattering studies. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2012; 83:035101. [PMID: 22462954 DOI: 10.1063/1.3688251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We present a pulsed-magnet system that enables x-ray single-crystal diffraction in addition to powder and spectroscopic studies with the magnetic field applied on or close to the scattering plane. The apparatus consists of a single large-bore solenoid, cooled by liquid nitrogen. A second independent closed-cycle cryostat is used for cooling samples near liquid helium temperatures. Pulsed magnetic fields close to ~30 T with a zero-to-peak-field rise time of ~2.9 ms are generated by discharging a 40 kJ capacitor bank into the magnet coil. The unique characteristic of this instrument is the preservation of maximum scattering angle (~23.6°) on the entrance and exit sides of the magnet bore by virtue of a novel double-funnel insert. This instrument will facilitate x-ray diffraction and spectroscopic studies that are impractical, if not impossible, to perform using split-pair and narrow-opening solenoid magnets. Furthermore, it offers a practical solution for preserving optical access in future higher-field pulsed magnets.
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Affiliation(s)
- Zahirul Islam
- X-Ray Science Division, Advanced Photon Source, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, Illinois 60439, USA
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12
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Islam Z, Ruff JPC, Ross KA, Nojiri H, Gaulin BD. Time-resolved one-dimensional detection of x-ray scattering in pulsed magnetic fields. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2012; 83:013113. [PMID: 22299935 DOI: 10.1063/1.3675478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We have developed an application of a one-dimensional micro-strip detector for capturing x-ray diffraction data in pulsed magnetic fields. This detector consists of a large array of 50 μm-wide Si strips with a full-frame read out at 20 kHz. Its use substantially improves data-collection efficiency and quality as compared to point detectors, because diffraction signals are recorded along an arc in reciprocal space in a time-resolved manner. By synchronizing with pulsed fields, the entire field dependence of a two-dimensional swath of reciprocal space may be determined using a small number of field pulses.
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Affiliation(s)
- Zahirul Islam
- X-Ray Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
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13
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Strohm C, Perrin F, Dominguez MC, Headspith J, van der Linden P, Mathon O. Multi-frame acquisition scheme for efficient energy-dispersive X-ray magnetic circular dichroism in pulsed high magnetic fields at the Fe K-edge. JOURNAL OF SYNCHROTRON RADIATION 2011; 18:224-228. [PMID: 21335909 PMCID: PMC3267639 DOI: 10.1107/s090904951100080x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/23/2010] [Accepted: 01/06/2011] [Indexed: 05/30/2023]
Abstract
Using a fast silicon strip detector, a multi-frame acquisition scheme was implemented to perform energy-dispersive X-ray magnetic circular dichroism at the iron K-edge in pulsed high magnetic fields. The acquisition scheme makes use of the entire field pulse. The quality of the signal obtained from samples of ferrimagnetic erbium iron garnet allows for quantitative evaluation of the signal amplitude. Below the compensation point, two successive field-induced phase transitions and the reversal of the net magnetization of the iron sublattices in the intermediate phase were observed.
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Affiliation(s)
- Cornelius Strohm
- European Synchrotron Radiation Facility, 6 rue Jules Horowitz, 38043 Grenoble, France.
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14
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Pascarelli S, Mathon O. Advances in high brilliance energy dispersive X-ray absorption spectroscopy. Phys Chem Chem Phys 2010; 12:5535-46. [DOI: 10.1039/b926509k] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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15
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Islam Z, Ruff JPC, Nojiri H, Matsuda YH, Ross KA, Gaulin BD, Qu Z, Lang JC. A portable high-field pulsed-magnet system for single-crystal x-ray scattering studies. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2009; 80:113902. [PMID: 19947737 DOI: 10.1063/1.3251273] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We present a portable pulsed-magnet system for x-ray studies of materials in high magnetic fields (up to 30 T). The apparatus consists of a split-pair of minicoils cooled on a closed-cycle cryostat, which is used for x-ray diffraction studies with applied field normal to the scattering plane. A second independent closed-cycle cryostat is used for cooling the sample to near liquid helium temperatures. Pulsed magnetic fields (approximately 1 ms in total duration) are generated by discharging a configurable capacitor bank into the magnet coils. Time-resolved scattering data are collected using a combination of a fast single-photon counting detector, a multichannel scaler, and a high-resolution digital storage oscilloscope. The capabilities of this instrument are used to study a geometrically frustrated system revealing strong magnetostrictive effects in the spin-liquid state.
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Affiliation(s)
- Zahirul Islam
- X-Ray Science Division, Advanced Photon Source, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, Illinois 60439, USA
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