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Si L, Wallerberger M, Smolyanyuk A, di Cataldo S, Tomczak JM, Held K. Pb 10-xCu x(PO 4) 6O: a Mott or charge transfer insulator in need of further doping for (super)conductivity. J Phys Condens Matter 2023; 36:065601. [PMID: 37875139 DOI: 10.1088/1361-648x/ad0673] [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: 08/10/2023] [Accepted: 10/24/2023] [Indexed: 10/26/2023]
Abstract
We briefly review the status quo of research on the putative superconductor Pb9Cu(PO4)6O also known as LK-99. Further, we provideab initioderived tight-binding parameters for a two- and five-band model, and solve these in dynamical-mean-field theory. The interaction-to-bandwidth ratio makes LK-99 a Mott or charge transfer insulator. Electron or hole doping (which is different from substituting Pb by Cu and thus differs from LK-99) is required to make it metallic and potentially superconducting.
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Affiliation(s)
- Liang Si
- School of Physics, Northwest University, Xi'an 710127, People's Republic of China
- Institute of Solid State Physics, TU Wien, 1040 Wien, Vienna, Austria
| | | | - Andriy Smolyanyuk
- Institute of Solid State Physics, TU Wien, 1040 Wien, Vienna, Austria
| | - Simone di Cataldo
- Institute of Solid State Physics, TU Wien, 1040 Wien, Vienna, Austria
| | - Jan M Tomczak
- Institute of Solid State Physics, TU Wien, 1040 Wien, Vienna, Austria
- Department of Physics, King's College London, Strand, London WC2R 2LS, United Kingdom
| | - Karsten Held
- Institute of Solid State Physics, TU Wien, 1040 Wien, Vienna, Austria
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2
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Ye L, Sun Y, Sunko V, Rodriguez-Nieva JF, Ikeda MS, Worasaran T, Sorensen ME, Bachmann MD, Orenstein J, Fisher IR. Elastocaloric signatures of symmetric and antisymmetric strain-tuning of quadrupolar and magnetic phases in DyB 2C 2. Proc Natl Acad Sci U S A 2023; 120:e2302800120. [PMID: 37607225 PMCID: PMC10468613 DOI: 10.1073/pnas.2302800120] [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: 02/17/2023] [Accepted: 07/22/2023] [Indexed: 08/24/2023] Open
Abstract
The adiabatic elastocaloric effect measures the temperature change of a given system with strain and provides a thermodynamic probe of the entropic landscape in the temperature-strain space. Here, we demonstrate that the DC bias strain-dependence of AC elastocaloric effect allows decomposition of the latter into symmetric (rotation-symmetry-preserving) and antisymmetric (rotation-symmetry-breaking) strain channels, using a tetragonal [Formula: see text]-electron intermetallic DyB[Formula: see text]C[Formula: see text]-whose antiferroquadrupolar order breaks local fourfold rotational symmetries while globally remaining tetragonal-as a showcase example. We capture the strain evolution of its quadrupolar and magnetic phase transitions using both singularities in the elastocaloric coefficient and its jumps at the transitions, and the latter we show follows a modified Ehrenfest relation. We find that antisymmetric strain couples to the underlying order parameter in a biquadratic (linear-quadratic) manner in the antiferroquadrupolar (canted antiferromagnetic) phase, which are attributed to a preserved (broken) global tetragonal symmetry, respectively. The broken tetragonal symmetry in the magnetic phase is further evidenced by elastocaloric strain-hysteresis and optical birefringence. Additionally, within the staggered quadrupolar order, the observed elastocaloric response reflects a quadratic increase of entropy with antisymmetric strain, analogous to the role magnetic field plays for Ising antiferromagnetic orders by promoting pseudospin flips. Our results demonstrate AC elastocaloric effect as a compact and incisive thermodynamic probe into the coupling between electronic degrees of freedom and strain in free energy, which holds the potential for investigating and understanding the symmetry of a wide variety of ordered phases in broader classes of quantum materials.
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Affiliation(s)
- Linda Ye
- Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA94305
- Department of Applied Physics, Stanford University, Stanford, CA94305
| | - Yue Sun
- Department of Physics, University of California, Berkeley, CA94720
- Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA94720
| | - Veronika Sunko
- Department of Physics, University of California, Berkeley, CA94720
- Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA94720
| | | | - Matthias S. Ikeda
- Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA94305
- Department of Applied Physics, Stanford University, Stanford, CA94305
| | - Thanapat Worasaran
- Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA94305
- Department of Applied Physics, Stanford University, Stanford, CA94305
| | - Matthew E. Sorensen
- Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA94305
- Department of Physics, Stanford University, Stanford, CA94305
| | - Maja D. Bachmann
- Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA94305
- Department of Applied Physics, Stanford University, Stanford, CA94305
| | - Joseph Orenstein
- Department of Physics, University of California, Berkeley, CA94720
- Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA94720
| | - Ian R. Fisher
- Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA94305
- Department of Applied Physics, Stanford University, Stanford, CA94305
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3
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Singh K, Sihi A, Pandey SK, Mukherjee K. Evidence of charge susceptibility and multiple f- chybridization configurations with the La doping in CeGe: a DFT + DMFT study. J Phys Condens Matter 2023; 35. [PMID: 37161911 DOI: 10.1088/1361-648x/acd09a] [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: 02/21/2023] [Accepted: 04/26/2023] [Indexed: 05/11/2023]
Abstract
Kondo coupling has been extensively investigated in several Ce-based systems. However, the search for materials showing the interplay between the Kondo effect, spin-orbit interaction, and crystal-field effect along with the presence of local charge susceptibility; remains a challenge for the condensed matter community. Actually, in Ce-based systems, the strong coupling of the conduction electrons to the local magnetic moments usually hides these properties. Here, we present a detailed investigation of Ce0.6La0.4Ge through a combined density functional theory and dynamic mean-field theory study. Our investigations give evidence of the significant charge susceptibility and the multiple differentf-chybridization configurations. The weakening of the magnetization owing to the dilution of the Ce-site is the main cause for the appearance of such properties, which is believed to occur due to the presence of the relevant local moment andf-chybridization over the competition with the on-site Coulomb interaction.
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Affiliation(s)
- Karan Singh
- School of Physical Sciences, Indian Institute of Technology Mandi, Mandi 175075, Himachal Pradesh, India
| | - Antik Sihi
- School of Physical Sciences, Indian Institute of Technology Mandi, Mandi 175075, Himachal Pradesh, India
| | - Sudhir K Pandey
- School of Mechanical and Materials Engineering, Indian Institute of Technology Mandi, Mandi 175075, Himachal Pradesh, India
| | - K Mukherjee
- School of Physical Sciences, Indian Institute of Technology Mandi, Mandi 175075, Himachal Pradesh, India
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4
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Adamus P, Xu B, Marsik P, Dubroka A, Barabasová P, Růžičková H, Puphal P, Pomjakushina E, Tallon JL, Mathis YL, Munzar D, Bernhard C. Analogies of phonon anomalies and electronic gap features in the infrared response of Sr14-xCa xCu 24O 41and underdoped YBa 2Cu 3O6+x. Rep Prog Phys 2023; 86:044502. [PMID: 36821858 DOI: 10.1088/1361-6633/acbe4f] [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: 09/16/2022] [Accepted: 02/23/2023] [Indexed: 06/18/2023]
Abstract
We present an experimental and theoretical study which compares the phonon anomalies and the electronic gap features in the infrared response of the weakly coupled two-leg-ladders in Sr14-xCaxCu24O41(SCCO) with those of the underdoped high-Tcsuperconductor YBa2Cu3O6+x(YBCO) and thereby reveals some surprising analogies. Specifically, we present a phenomenological model that describes the anomalous doping- and temperature-dependence of some of the phonon features in thea-axis response (field along the rungs of the ladders) of SCCO. It assumes that the phonons are coupled to charge oscillations within the ladders. Their changes with decreasing temperature reveal the formation of a crystal (density wave) of hole pairs that are oriented along the rungs. We also discuss the analogy to a similar model that was previously used to explain the phonon anomalies and an electronic plasma mode in thec-axis response (field perpendicular to the CuO2planes) of YBCO. We further confirm that an insulator-like pseudogap develops in thea-axis conductivity of SCCO which closely resembles that in thec-axis conductivity of YBCO. Most surprisingly, we find that thec-axis conductivity (field along the legs of the ladders) of SCCO is strikingly similar to the in-plane one (field parallel to the CuO2planes) of YBCO. Notably, in both cases a dip feature develops in the normal state spectra that is connected with a spectral weight shift toward low frequencies and can thus be associated with precursor superconducting pairing correlations that are lacking macroscopic phase coherence. This SCCO-YBCO analogy indicates that collective degrees of freedom contribute to the low-energy response of underdoped highTccuprates and it even suggests that the charges in the CuO2planes tend to segregate forming quasi-one-dimensional structures similar to the two-leg ladders, as predicted for the stripe-scenario or certain intertwinned states.
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Affiliation(s)
- Petr Adamus
- Department of Condensed Matter Physics, Faculty of Science, Masaryk University, Kotlářská 2, 61137 Brno, Czech Republic
| | - Bing Xu
- University of Fribourg, Department of Physics, Chemin du Musée 3, CH-1700 Fribourg, Switzerland
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Premysl Marsik
- University of Fribourg, Department of Physics, Chemin du Musée 3, CH-1700 Fribourg, Switzerland
| | - Adam Dubroka
- Department of Condensed Matter Physics, Faculty of Science, Masaryk University, Kotlářská 2, 61137 Brno, Czech Republic
| | - Paulína Barabasová
- Department of Condensed Matter Physics, Faculty of Science, Masaryk University, Kotlářská 2, 61137 Brno, Czech Republic
| | - Hana Růžičková
- Department of Condensed Matter Physics, Faculty of Science, Masaryk University, Kotlářská 2, 61137 Brno, Czech Republic
| | - Pascal Puphal
- Laboratory for Multiscale Materials Experiments, PSI, 5232 Villigen, Switzerland
- Max Planck Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany
| | | | - Jeffery L Tallon
- Victoria University of Wellington, Robinson Research Institute, POB 33436, Lower Hutt 5046, New Zealand
| | - Yves-Laurent Mathis
- Karlsruhe Institute of Technology, Institute for Beam Physics and Technology, Hermann-von-Helmhotz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
| | - Dominik Munzar
- Department of Condensed Matter Physics, Faculty of Science, Masaryk University, Kotlářská 2, 61137 Brno, Czech Republic
| | - Christian Bernhard
- University of Fribourg, Department of Physics, Chemin du Musée 3, CH-1700 Fribourg, Switzerland
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5
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Sarkar A, Wang D, Kante MV, Eiselt L, Trouillet V, Iankevich G, Zhao Z, Bhattacharya SS, Hahn H, Kruk R. High Entropy Approach to Engineer Strongly Correlated Functionalities in Manganites. Adv Mater 2023; 35:e2207436. [PMID: 36383029 DOI: 10.1002/adma.202207436] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Revised: 11/04/2022] [Indexed: 06/16/2023]
Abstract
Technologically relevant strongly correlated phenomena such as colossal magnetoresistance (CMR) and metal-insulator transitions (MIT) exhibited by perovskite manganites are driven and enhanced by the coexistence of multiple competing magneto-electronic phases. Such magneto-electronic inhomogeneity is governed by the intrinsic lattice-charge-spin-orbital correlations, which, in turn, are conventionally tailored in manganites via chemical substitution, charge doping, or strain engineering. Alternately, the recently discovered high entropy oxides (HEOs), owing to the presence of multiple-principal cations on a given sub-lattice, exhibit indications of an inherent magneto-electronic phase separation encapsulated in a single crystallographic phase. Here, the high entropy (HE) concept is combined with standard property control by hole doping in a series of single-phase orthorhombic HE-manganites (HE-Mn), (Gd0.25 La0.25 Nd0.25 Sm0.25 )1- x Srx MnO3 (x = 0-0.5). High-resolution transmission microscopy reveals hitherto-unknown lattice imperfections in HEOs: twins, stacking faults, and missing planes. Magnetometry and electrical measurements infer three distinct ground states-insulating antiferromagnetic, unpercolated metallic ferromagnetic, and long-range metallic ferromagnetic-coexisting or/and competing as a result of hole doping and multi-cation complexity. Consequently, CMR ≈1550% stemming from an MIT is observed in polycrystalline pellets, matching the best-known values for bulk conventional manganites. Hence, this initial case study highlights the potential for a synergetic development of strongly correlated oxides offered by the high entropy design approach.
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Affiliation(s)
- Abhishek Sarkar
- KIT-TUD Joint Research Laboratory Nanomaterials - Technische Universität Darmstadt, Otto-Berndt-Str. 3, 64287, Darmstadt, Germany
- Institute of Nanotechnology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - Di Wang
- Institute of Nanotechnology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
- Karlsruhe Nano Micro Facility (KNMFi), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - Mohana V Kante
- Institute of Nanotechnology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - Luis Eiselt
- KIT-TUD Joint Research Laboratory Nanomaterials - Technische Universität Darmstadt, Otto-Berndt-Str. 3, 64287, Darmstadt, Germany
| | - Vanessa Trouillet
- Karlsruhe Nano Micro Facility (KNMFi), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
- Institute for Applied Materials (IAM-ESS), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - Gleb Iankevich
- Institute of Nanotechnology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
- Institute for Quantum Materials and Technologies (IQMT), Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - Zhibo Zhao
- Institute of Nanotechnology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - Subramshu S Bhattacharya
- Nanofunctional Materials Technology Centre (NFMTC), Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai, 600036, India
| | - Horst Hahn
- KIT-TUD Joint Research Laboratory Nanomaterials - Technische Universität Darmstadt, Otto-Berndt-Str. 3, 64287, Darmstadt, Germany
- Institute of Nanotechnology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
- Institute for Quantum Materials and Technologies (IQMT), Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - Robert Kruk
- Institute of Nanotechnology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
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6
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Marques CA, Rhodes LC, Fittipaldi R, Granata V, Yim CM, Buzio R, Gerbi A, Vecchione A, Rost AW, Wahl P. Magnetic-Field Tunable Intertwined Checkerboard Charge Order and Nematicity in the Surface Layer of Sr 2 RuO 4. Adv Mater 2021; 33:e2100593. [PMID: 34176160 DOI: 10.1002/adma.202100593] [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: 01/22/2021] [Revised: 04/21/2021] [Indexed: 06/13/2023]
Abstract
In strongly correlated electron materials, the electronic, spin, and charge degrees of freedom are closely intertwined. This often leads to the stabilization of emergent orders that are highly sensitive to external physical stimuli promising opportunities for technological applications. In perovskite ruthenates, this sensitivity manifests in dramatic changes of the physical properties with subtle structural details of the RuO6 octahedra, stabilizing enigmatic correlated ground states, from a hotly debated superconducting state via electronic nematicity and metamagnetic quantum criticality to ferromagnetism. Here, it is demonstrated that the rotation of the RuO6 octahedra in the surface layer of Sr2 RuO4 generates new emergent orders not observed in the bulk material. Through atomic-scale spectroscopic characterization of the low-energy electronic states, four van Hove singularities are identified in the vicinity of the Fermi energy. The singularities can be directly linked to intertwined nematic and checkerboard charge order. Tuning of one of these van Hove singularities by magnetic field is demonstrated, suggesting that the surface layer undergoes a Lifshitz transition at a magnetic field of ≈32T. The results establish the surface layer of Sr2 RuO4 as an exciting 2D correlated electron system and highlight the opportunities for engineering the low-energy electronic states in these systems.
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Affiliation(s)
- Carolina A Marques
- School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife, KY16 9SS, UK
| | - Luke C Rhodes
- School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife, KY16 9SS, UK
| | - Rosalba Fittipaldi
- CNR-SPIN, UOS Salerno, Via Giovanni Paolo II 132, Fisciano, I-84084, Italy
| | - Veronica Granata
- Dipartimento di Fisica "E. R. Caianiello" Universitá di Salerno, Fisciano, Salerno, I-84084, Italy
| | - Chi Ming Yim
- School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife, KY16 9SS, UK
| | - Renato Buzio
- CNR-SPIN, Corso F.M. Perrone 24, Genova, 16152, Italy
| | - Andrea Gerbi
- CNR-SPIN, Corso F.M. Perrone 24, Genova, 16152, Italy
| | - Antonio Vecchione
- CNR-SPIN, UOS Salerno, Via Giovanni Paolo II 132, Fisciano, I-84084, Italy
| | - Andreas W Rost
- School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife, KY16 9SS, UK
- Max-Planck-Institute for Solid State Research, Heisenbergstr. 1, 70569, Stuttgart, Germany
| | - Peter Wahl
- School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife, KY16 9SS, UK
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7
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Amorese A, Sundermann M, Leedahl B, Marino A, Takegami D, Gretarsson H, Gloskovskii A, Schlueter C, Haverkort MW, Huang Y, Szlawska M, Kaczorowski D, Ran S, Maple MB, Bauer ED, Leithe-Jasper A, Hansmann P, Thalmeier P, Tjeng LH, Severing A. From antiferromagnetic and hidden order to Pauli paramagnetism in U M 2Si 2 compounds with 5 f electron duality. Proc Natl Acad Sci U S A 2020; 117:30220-30227. [PMID: 33203673 PMCID: PMC7720184 DOI: 10.1073/pnas.2005701117] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [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] [Indexed: 12/03/2022] Open
Abstract
Using inelastic X-ray scattering beyond the dipole limit and hard X-ray photoelectron spectroscopy we establish the dual nature of the U [Formula: see text] electrons in U[Formula: see text] (M = Pd, Ni, Ru, Fe), regardless of their degree of delocalization. We have observed that the compounds have in common a local atomic-like state that is well described by the U [Formula: see text] configuration with the [Formula: see text] and [Formula: see text] quasi-doublet symmetry. The amount of the U 5[Formula: see text] configuration, however, varies considerably across the U[Formula: see text] series, indicating an increase of U 5f itineracy in going from M = Pd to Ni to Ru and to the Fe compound. The identified electronic states explain the formation of the very large ordered magnetic moments in [Formula: see text] and [Formula: see text], the availability of orbital degrees of freedom needed for the hidden order in [Formula: see text] to occur, as well as the appearance of Pauli paramagnetism in [Formula: see text] A unified and systematic picture of the U[Formula: see text] compounds may now be drawn, thereby providing suggestions for additional experiments to induce hidden order and/or superconductivity in U compounds with the tetragonal body-centered [Formula: see text] structure.
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Affiliation(s)
- Andrea Amorese
- Institute of Physics II, University of Cologne, 50937 Cologne, Germany
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - Martin Sundermann
- Institute of Physics II, University of Cologne, 50937 Cologne, Germany
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - Brett Leedahl
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - Andrea Marino
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - Daisuke Takegami
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - Hlynur Gretarsson
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
- Positron-Elektron-Tandem-Ring-Anlage III (PETRA III), Deutsches Elektronen-Synchrotron, 22607 Hamburg, Germany
| | - Andrei Gloskovskii
- Positron-Elektron-Tandem-Ring-Anlage III (PETRA III), Deutsches Elektronen-Synchrotron, 22607 Hamburg, Germany
| | - Christoph Schlueter
- Positron-Elektron-Tandem-Ring-Anlage III (PETRA III), Deutsches Elektronen-Synchrotron, 22607 Hamburg, Germany
| | - Maurits W Haverkort
- Institute for Theoretical Physics, Heidelberg University, 69120 Heidelberg, Germany
| | - Yingkai Huang
- van der Waals-Zeeman Institute, University of Amsterdam, 1098 XH Amsterdam, The Netherlands
| | - Maria Szlawska
- Institute of Low Temperature & Structure Research, Polish Academy of Science, 50-950 Wroclaw, Poland
| | - Dariusz Kaczorowski
- Institute of Low Temperature & Structure Research, Polish Academy of Science, 50-950 Wroclaw, Poland
| | - Sheng Ran
- Department of Physics, University of California San Diego, La Jolla, CA 92093
| | - M Brian Maple
- Department of Physics, University of California San Diego, La Jolla, CA 92093
| | - Eric D Bauer
- MPA-Q, Los Alamos National Laboratory, Los Alamos, NM 87545
| | | | - Philipp Hansmann
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
- Department of Physics, University of Erlangen-Nuremberg, 91058 Erlangen, Germany
| | - Peter Thalmeier
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - Liu Hao Tjeng
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - Andrea Severing
- Institute of Physics II, University of Cologne, 50937 Cologne, Germany;
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
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8
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Mazzone DG, Raymond S, Gavilano JL, Ressouche E, Niedermayer C, Birk JO, Ouladdiaf B, Bastien G, Knebel G, Aoki D, Lapertot G, Kenzelmann M. Field-induced magnetic instability within a superconducting condensate. Sci Adv 2017; 3:e1602055. [PMID: 28560326 PMCID: PMC5438216 DOI: 10.1126/sciadv.1602055] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Accepted: 03/20/2017] [Indexed: 06/07/2023]
Abstract
The application of magnetic fields, chemical substitution, or hydrostatic pressure to strongly correlated electron materials can stabilize electronic phases with different organizational principles. We present evidence for a field-induced quantum phase transition, in superconducting Nd0.05Ce0.95CoIn5, that separates two antiferromagnetic phases with identical magnetic symmetry. At zero field, we find a spin-density wave that is suppressed at the critical field μ0H* = 8 T. For H > H*, a spin-density phase emerges and shares many properties with the Q phase in CeCoIn5. These results suggest that the magnetic instability is not magnetically driven, and we propose that it is driven by a modification of superconducting condensate at H*.
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Affiliation(s)
- Daniel Gabriel Mazzone
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
| | - Stéphane Raymond
- Institute for Nanosciences and Cryogenics, Commissariat à l’Energie Atomique et aux Energies Alternatives, Université Grenoble Alpes, 38054 Grenoble, France
| | - Jorge Luis Gavilano
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
| | - Eric Ressouche
- Institute for Nanosciences and Cryogenics, Commissariat à l’Energie Atomique et aux Energies Alternatives, Université Grenoble Alpes, 38054 Grenoble, France
| | - Christof Niedermayer
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
| | - Jonas Okkels Birk
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
- Department of Physics, Technical University of Denmark (DTU), DK-2800 Kongens Lyngby, Denmark
| | | | - Gaël Bastien
- Institute for Nanosciences and Cryogenics, Commissariat à l’Energie Atomique et aux Energies Alternatives, Université Grenoble Alpes, 38054 Grenoble, France
| | - Georg Knebel
- Institute for Nanosciences and Cryogenics, Commissariat à l’Energie Atomique et aux Energies Alternatives, Université Grenoble Alpes, 38054 Grenoble, France
| | - Dai Aoki
- Institute for Nanosciences and Cryogenics, Commissariat à l’Energie Atomique et aux Energies Alternatives, Université Grenoble Alpes, 38054 Grenoble, France
| | - Gérard Lapertot
- Institute for Nanosciences and Cryogenics, Commissariat à l’Energie Atomique et aux Energies Alternatives, Université Grenoble Alpes, 38054 Grenoble, France
| | - Michel Kenzelmann
- Laboratory for Scientific Developments and Novel Materials, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
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9
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Sundermann M, Haverkort MW, Agrestini S, Al-Zein A, Moretti Sala M, Huang Y, Golden M, de Visser A, Thalmeier P, Tjeng LH, Severing A. Direct bulk-sensitive probe of 5f symmetry in URu2Si2. Proc Natl Acad Sci U S A 2016; 113:13989-94. [PMID: 27872287 DOI: 10.1073/pnas.1612791113] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The second-order phase transition into a hidden order phase in URu2Si2 goes along with an order parameter that is still a mystery, despite 30 years of research. However, it is understood that the symmetry of the order parameter must be related to the symmetry of the low-lying local electronic [Formula: see text]-states. Here, we present results of a spectroscopic technique, namely core-level nonresonant inelastic X-ray scattering (NIXS). This method allows for the measurement of local high-multipole excitations and is bulk-sensitive. The observed anisotropy of the scattering function unambiguously shows that the 5[Formula: see text] ground-state wave function is composed mainly of the [Formula: see text] with majority [Formula: see text] = [Formula: see text] + [Formula: see text] and/or [Formula: see text] singlet states. The incomplete dichroism indicates the possibility that quantum states of other irreducible representation are mixed into the ground state.
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10
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Gyenis A, da Silva Neto EH, Sutarto R, Schierle E, He F, Weschke E, Kavai M, Baumbach RE, Thompson JD, Bauer ED, Fisk Z, Damascelli A, Yazdani A, Aynajian P. Quasi-particle interference of heavy fermions in resonant x-ray scattering. Sci Adv 2016; 2:e1601086. [PMID: 27757422 PMCID: PMC5065254 DOI: 10.1126/sciadv.1601086] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/13/2016] [Accepted: 09/16/2016] [Indexed: 06/06/2023]
Abstract
Resonant x-ray scattering (RXS) has recently become an increasingly important tool for the study of ordering phenomena in correlated electron systems. Yet, the interpretation of RXS experiments remains theoretically challenging because of the complexity of the RXS cross section. Central to this debate is the recent proposal that impurity-induced Friedel oscillations, akin to quasi-particle interference signals observed with a scanning tunneling microscope (STM), can lead to scattering peaks in RXS experiments. The possibility that quasi-particle properties can be probed in RXS measurements opens up a new avenue to study the bulk band structure of materials with the orbital and element selectivity provided by RXS. We test these ideas by combining RXS and STM measurements of the heavy fermion compound CeMIn5 (M = Co, Rh). Temperature- and doping-dependent RXS measurements at the Ce-M4 edge show a broad scattering enhancement that correlates with the appearance of heavy f-electron bands in these compounds. The scattering enhancement is consistent with the measured quasi-particle interference signal in the STM measurements, indicating that the quasi-particle interference can be probed through the momentum distribution of RXS signals. Overall, our experiments demonstrate new opportunities for studies of correlated electronic systems using the RXS technique.
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Affiliation(s)
- András Gyenis
- Joseph Henry Laboratories and Department of Physics, Princeton University, Princeton, NJ 08544, USA
| | - Eduardo H. da Silva Neto
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
- Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
- Max Planck Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
- Quantum Materials Program, Canadian Institute for Advanced Research, Toronto, Ontario M5G 1Z8, Canada
| | - Ronny Sutarto
- Canadian Light Source, Saskatoon, Saskatchewan S7N 2V3, Canada
| | - Enrico Schierle
- Helmholtz-Zentrum Berlin fürMaterialien und Energie, Albert-Einstein-Strasse 15, D-12489 Berlin, Germany
| | - Feizhou He
- Helmholtz-Zentrum Berlin fürMaterialien und Energie, Albert-Einstein-Strasse 15, D-12489 Berlin, Germany
| | - Eugen Weschke
- Helmholtz-Zentrum Berlin fürMaterialien und Energie, Albert-Einstein-Strasse 15, D-12489 Berlin, Germany
| | - Mariam Kavai
- Department of Physics, Applied Physics and Astronomy, Binghamton University, Binghamton, NY 13902, USA
| | | | | | - Eric D. Bauer
- Los Alamos National Laboratory, Los Alamos, NM 87545, USA
| | - Zachary Fisk
- Department of Physics and Astronomy, University of California, Irvine, Irvine, CA 92697, USA
| | - Andrea Damascelli
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
- Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
| | - Ali Yazdani
- Joseph Henry Laboratories and Department of Physics, Princeton University, Princeton, NJ 08544, USA
| | - Pegor Aynajian
- Department of Physics, Applied Physics and Astronomy, Binghamton University, Binghamton, NY 13902, USA
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Fujiwara H, Naimen S, Higashiya A, Kanai Y, Yomosa H, Yamagami K, Kiss T, Kadono T, Imada S, Yamasaki A, Takase K, Otsuka S, Shimizu T, Shingubara S, Suga S, Yabashi M, Tamasaku K, Ishikawa T, Sekiyama A. Polarized hard X-ray photoemission system with micro-positioning technique for probing ground-state symmetry of strongly correlated materials. J Synchrotron Radiat 2016; 23:735-742. [PMID: 27140153 PMCID: PMC5356621 DOI: 10.1107/s1600577516003003] [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] [Figures] [Subscribe] [Scholar Register] [Received: 12/05/2015] [Accepted: 02/19/2016] [Indexed: 06/05/2023]
Abstract
An angle-resolved linearly polarized hard X-ray photoemission spectroscopy (HAXPES) system has been developed to study the ground-state symmetry of strongly correlated materials. The linear polarization of the incoming X-ray beam is switched by a transmission-type phase retarder composed of two diamond (100) crystals. The best value of the degree of linear polarization was found to be -0.96, containing a vertical polarization component of 98%. A newly developed low-temperature two-axis manipulator enables easy polar and azimuthal rotations to select the detection direction of photoelectrons. The lowest temperature achieved was 9 K, offering the chance to access the ground state even for strongly correlated electron systems in cubic symmetry. A co-axial sample monitoring system with long-working-distance microscope enables the same region on the sample surface to be measured before and after rotation. Combining this sample monitoring system with a micro-focused X-ray beam by means of an ellipsoidal Kirkpatrick-Baez mirror (25 µm × 25 µm FWHM), polarized valence-band HAXPES has been performed on NiO for voltage application as resistive random access memory to demonstrate the micro-positioning technique and polarization switching.
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Affiliation(s)
- Hidenori Fujiwara
- Division of Materials Physics, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
- SPring-8/RIKEN, Sayo, Hyogo 679-5148, Japan
| | - Sho Naimen
- Division of Materials Physics, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
| | - Atsushi Higashiya
- SPring-8/RIKEN, Sayo, Hyogo 679-5148, Japan
- Faculty of Science and Engineering, Setsunan University, Neyagawa, Osaka 572-8508, Japan
| | - Yuina Kanai
- Division of Materials Physics, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
- SPring-8/RIKEN, Sayo, Hyogo 679-5148, Japan
| | - Hiroshi Yomosa
- Division of Materials Physics, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
- SPring-8/RIKEN, Sayo, Hyogo 679-5148, Japan
| | - Kohei Yamagami
- Division of Materials Physics, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
- SPring-8/RIKEN, Sayo, Hyogo 679-5148, Japan
| | - Takayuki Kiss
- Division of Materials Physics, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
- SPring-8/RIKEN, Sayo, Hyogo 679-5148, Japan
| | - Toshiharu Kadono
- SPring-8/RIKEN, Sayo, Hyogo 679-5148, Japan
- Department of Physical Science, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
| | - Shin Imada
- SPring-8/RIKEN, Sayo, Hyogo 679-5148, Japan
- Department of Physical Science, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
| | - Atsushi Yamasaki
- SPring-8/RIKEN, Sayo, Hyogo 679-5148, Japan
- Faculty of Science and Engineering, Konan University, Kobe 658-8501, Japan
| | - Kouichi Takase
- Department of Physics, College of Science and Technology, Nihon University, Chiyoda, Tokyo 101-0062, Japan
| | - Shintaro Otsuka
- Graduate School of Science and Technology, Kansai University, Suita, Osaka 564-8680, Japan
| | - Tomohiro Shimizu
- Graduate School of Science and Technology, Kansai University, Suita, Osaka 564-8680, Japan
| | - Shoso Shingubara
- Graduate School of Science and Technology, Kansai University, Suita, Osaka 564-8680, Japan
| | - Shigemasa Suga
- SPring-8/RIKEN, Sayo, Hyogo 679-5148, Japan
- Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | | | | | | | - Akira Sekiyama
- Division of Materials Physics, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
- SPring-8/RIKEN, Sayo, Hyogo 679-5148, Japan
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Murakami Y, Suzuki T, Nii Y, Murai S, Arima T, Kainuma R, Shindo D. Application of strain to orbital-spin-coupled system MnV2O4 at cryogenic temperatures within a transmission electron microscope. Microscopy (Oxf) 2016; 65:223-32. [PMID: 26754562 DOI: 10.1093/jmicro/dfv377] [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] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2015] [Accepted: 11/30/2015] [Indexed: 11/14/2022] Open
Abstract
The impact of mechanical stress on the morphology of crystallographic and magnetic domains in shape-controlled specimens of an orbital-spin-coupled system, MnV2O4, was examined by cryogenic Lorentz microscopy. Because of the difference in thermal expansion coefficients of MnV2O4 and the supporting Mo mesh, compression on the order of 0.01% was applied to the thin-foil specimens near the structural/magnetic phase transformation temperatures. The extent of compression was comparable to the lattice striction associated with the cubic-to-tetragonal phase transformation in MnV2O4 The applied strain thus clearly influenced the morphology of crystallographic domains (i.e. twinning configuration in the tetragonal phase) produced during cooling. The magnetic domain structure was entirely dependent on the configuration of twinning in the tetragonal phase. The observations in this study provided useful information for understanding the relationship between the crystallographic domains and the magnetic domains in MnV2O4.
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Affiliation(s)
- Y Murakami
- The Ultramicroscopy Research Center, Kyushu University, Fukuoka 819-0395, Japan Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University, Fukuoka 819-0395, Japan RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
| | - T Suzuki
- JEOL Ltd., Akishima 196-8558, Japan
| | - Y Nii
- Department of Basic Science, The University of Tokyo, Tokyo 153-8902, Japan
| | - S Murai
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
| | - T Arima
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan Department of Advanced Materials Science, The University of Tokyo, Kashiwa 277-8561, Japan
| | - R Kainuma
- Department of Materials Science, Tohoku University, Sendai 980-8579, Japan
| | - D Shindo
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
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Tan BS, Harrison N, Zhu Z, Balakirev F, Ramshaw BJ, Srivastava A, Sabok-Sayr SA, Dabrowski B, Lonzarich GG, Sebastian SE. Fragile charge order in the nonsuperconducting ground state of the underdoped high-temperature superconductors. Proc Natl Acad Sci U S A 2015; 112:9568-72. [PMID: 26199413 DOI: 10.1073/pnas.1504164112] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The normal state in the hole underdoped copper oxide superconductors has proven to be a source of mystery for decades. The measurement of a small Fermi surface by quantum oscillations on suppression of superconductivity by high applied magnetic fields, together with complementary spectroscopic measurements in the hole underdoped copper oxide superconductors, point to a nodal electron pocket from charge order in YBa2Cu3(6+δ). Here, we report quantum oscillation measurements in the closely related stoichiometric material YBa2Cu4O8, which reveals similar Fermi surface properties to YBa2Cu3(6+δ), despite the nonobservation of charge order signatures in the same spectroscopic techniques, such as X-ray diffraction, that revealed signatures of charge order in YBa2Cu3(6+δ). Fermi surface reconstruction in YBa2Cu4O8 is suggested to occur from magnetic field enhancement of charge order that is rendered fragile in zero magnetic fields because of its potential unconventional nature and/or its occurrence as a subsidiary to more robust underlying electronic correlations.
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Han TRT, Zhou F, Malliakas CD, Duxbury PM, Mahanti SD, Kanatzidis MG, Ruan CY. Exploration of metastability and hidden phases in correlated electron crystals visualized by femtosecond optical doping and electron crystallography. Sci Adv 2015; 1:e1400173. [PMID: 26601190 PMCID: PMC4640616 DOI: 10.1126/sciadv.1400173] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2014] [Accepted: 05/26/2015] [Indexed: 05/06/2023]
Abstract
Characterizing and understanding the emergence of multiple macroscopically ordered electronic phases through subtle tuning of temperature, pressure, and chemical doping has been a long-standing central issue for complex materials research. We report the first comprehensive studies of optical doping-induced emergence of stable phases and metastable hidden phases visualized in situ by femtosecond electron crystallography. The electronic phase transitions are triggered by femtosecond infrared pulses, and a temperature-optical density phase diagram is constructed and substantiated with the dynamics of metastable states, highlighting the cooperation and competition through which the macroscopic quantum orders emerge. These results elucidate key pathways of femtosecond electronic switching phenomena and provide an important new avenue to comprehensively investigate optical doping-induced transition states and phase diagrams of complex materials with wide-ranging applications.
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Affiliation(s)
- Tzong-Ru T. Han
- Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA
| | - Faran Zhou
- Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA
| | - Christos D. Malliakas
- Department of Chemistry, Northwestern University, Evanston, IL 60208, USA
- Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - Phillip M. Duxbury
- Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA
| | - Subhendra D. Mahanti
- Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA
| | - Mercouri G. Kanatzidis
- Department of Chemistry, Northwestern University, Evanston, IL 60208, USA
- Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - Chong-Yu Ruan
- Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA
- Corresponding author. E-mail:
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