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Liu Y, Wang A, Du Q, Wu L, Zhu Y, Petrovic C. Nanoscale inhomogeneity and the evolution of correlation strength in FeSe[Formula: see text]S[Formula: see text]. NANO CONVERGENCE 2023; 10:59. [PMID: 38133699 PMCID: PMC10746694 DOI: 10.1186/s40580-023-00405-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2023] [Accepted: 11/26/2023] [Indexed: 12/23/2023]
Abstract
We report a comprehensive study of the nanoscale inhomogeneity and disorder on the thermoelectric properties of FeSe[Formula: see text]S[Formula: see text] ([Formula: see text]) single crystals and the evolution of correlation strength with S substitution. A hump-like feature in temperature-dependent thermpower is enhanced for x = 0.12 and 0.14 in the nematic region with increasing in orbital-selective electronic correlations, which is strongly suppressed across the nematic critical point and for higher S content. Nanoscale Se/S atom disorder in the tetrahedral surroundings of Fe atoms is confirmed by scanning transmission electron microscopy measurements, providing an insight into the nanostructural details and the evolution of correlation strength in FeSe[Formula: see text]S[Formula: see text].
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Affiliation(s)
- Yu Liu
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973 USA
- Center for Correlated Matter and School of Physics, Zhejiang University, Hangzhou, 310058 China
| | - Aifeng Wang
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973 USA
- Present Address: College of Physics, Chongqing University, Chongqing, 401331 China
| | - Qianheng Du
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973 USA
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, NeY 11790 USA
- Present Address: Material Science Division, Argonne National Laboratory, Lemont, IL 60439 USA
| | - Lijun Wu
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973 USA
| | - Yimei Zhu
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973 USA
| | - Cedomir Petrovic
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973 USA
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, NeY 11790 USA
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Wakamatsu K, Suzuki Y, Fujii T, Miyagawa K, Taniguchi H, Kanoda K. Thermoelectric signature of quantum critical phase in a doped spin-liquid candidate. Nat Commun 2023; 14:3679. [PMID: 37344458 DOI: 10.1038/s41467-023-39217-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2022] [Accepted: 05/31/2023] [Indexed: 06/23/2023] Open
Abstract
Quantum spin liquid is a nontrivial magnetic state of longstanding interest, in which spins are strongly correlated and entangled but do not order; further intriguing is its doped version, which possibly hosts strange metal and unconventional superconductivity. A promising candidate of the doped spin liquid is a triangular-lattice organic conductor, κ-(BEDT-TTF)4Hg2.89Br8, recently found to hold metallicity, spin-liquid-like magnetism, and BEC-like superconductivity. The nature of the metallic state with the spin-liquid behaviour is awaiting to be further clarified. Here, we report the thermoelectric signature that mobile holes in the spin liquid background are in a quantum critical state and it pertains to the BEC-like superconductivity. The Seebeck coefficient divided by temperature, S/T, is enhanced on cooling with logarithmic divergence indicative of quantum criticality. Furthermore, the logarithmic enhancement is correlated with the superconducting transition temperature under pressure variation, and the temperature and magnetic field profile of S/T upon the superconducting transition change with pressure in a consistent way with the previously suggested BEC-BCS crossover. The present results reveal that the quantum criticality in a doped spin liquid emerges in a phase, not at a point, and is involved in the unconventional BEC-like nature.
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Affiliation(s)
- K Wakamatsu
- Department of Applied Physics, University of Tokyo; Bunkyo-ku, Tokyo, 113-8656, Japan
| | - Y Suzuki
- Department of Applied Physics, University of Tokyo; Bunkyo-ku, Tokyo, 113-8656, Japan
| | - T Fujii
- Cryogenic Research Center, University of Tokyo; Bunkyo-ku, Tokyo, 113-0032, Japan
| | - K Miyagawa
- Department of Applied Physics, University of Tokyo; Bunkyo-ku, Tokyo, 113-8656, Japan
| | - H Taniguchi
- Graduate School of Science and Engineering, Saitama University, Saitama, 338-8570, Japan
| | - K Kanoda
- Department of Applied Physics, University of Tokyo; Bunkyo-ku, Tokyo, 113-8656, Japan.
- Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569, Stuttgart, Germany.
- Physics Institute, University of Stuttgart, Pfaffenwaldring 57, D-70569, Stuttgart, Germany.
- Department of Advanced Materials Science, University of Tokyo, Kashiwanoha 5-1-5, Kashiwa, 277-8561, Chiba, Japan.
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First-principles calculations of effects of pressure on paramagnetic, ferromagnetic, and antiferromagnetic spin-web Cu 3TeO 6. J Mol Model 2021; 27:129. [PMID: 33884502 DOI: 10.1007/s00894-021-04747-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Accepted: 04/14/2021] [Indexed: 11/27/2022]
Abstract
The structure, electronic, and magnetic properties have been investigated by the first-principles calculations for paramagnetic, ferromagnetic, and antiferromagnetic Cu3TeO6 under pressure from 0 to 100 GPa. The calculated lattice parameters at 0 GPa are in excellent agreement with the available calculated and experimental values. With increasing pressure, the lattice parameters and volume decrease, but Cu3TeO6 keeps a stable cubic structure. The electronic calculations show that paramagnetic and ferromagnetic Cu3TeO6 are metallic, and antiferromagnetic Cu3TeO6 is non-metallic with a direct band gap which decreases with the increasing pressure. Under the pressure, their non-locality of density of states enhances and the electrons become more active. Moreover, for antiferromagnetic Cu3TeO6, the spin moments of Cu atoms are affected obviously by pressures, and Te atoms show nonmagnetic performance. The total magnetic moment, which is mainly contributed by Cu, reaches the maximum at 20 GPa, and decreases with the increasing pressure. The knowledge of these properties will provide reference and guidance for the subsequent study of Cu3TeO6.
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Sarkar T, Wei DS, Zhang J, Poniatowski NR, Mandal PR, Kapitulnik A, Greene RL. Ferromagnetic order beyond the superconducting dome in a cuprate superconductor. Science 2020; 368:532-534. [PMID: 32355032 DOI: 10.1126/science.aax1581] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Revised: 10/23/2019] [Accepted: 03/25/2020] [Indexed: 11/02/2022]
Abstract
According to conventional wisdom, the extraordinary properties of the cuprate high-temperature superconductors arise from doping a strongly correlated antiferromagnetic insulator. The highly overdoped cuprates-whose doping lies beyond the dome of superconductivity-are considered to be conventional Fermi liquid metals. We report the emergence of itinerant ferromagnetic order below 4 kelvin for doping beyond the superconducting dome in thin films of electron-doped La2- x Ce x CuO4 (LCCO). The existence of this ferromagnetic order is evidenced by negative, anisotropic, and hysteretic magnetoresistance, hysteretic magnetization, and the polar Kerr effect, all of which are standard signatures of itinerant ferromagnetism in metals. This surprising result suggests that the overdoped cuprates are strongly influenced by electron correlations.
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Affiliation(s)
- Tarapada Sarkar
- Maryland Quantum Materials Center and Department of Physics, University of Maryland, College Park, MD 20742, USA
| | - D S Wei
- Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA 94305, USA
- Department of Applied Physics, Stanford University, Stanford, CA 94305, USA
| | - J Zhang
- State Key Laboratory of Surface Physics, Department of Physics, Fudan University, Shanghai 200433, People's Republic of China
| | - N R Poniatowski
- Maryland Quantum Materials Center and Department of Physics, University of Maryland, College Park, MD 20742, USA
| | - P R Mandal
- Maryland Quantum Materials Center and Department of Physics, University of Maryland, College Park, MD 20742, USA
| | - A Kapitulnik
- Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA 94305, USA
- Department of Applied Physics, Stanford University, Stanford, CA 94305, USA
- Department of Physics, Stanford University, Stanford, CA 94305, USA
- Stanford Institute for Materials and Energy Sciences (SIMES), SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - Richard L Greene
- Maryland Quantum Materials Center and Department of Physics, University of Maryland, College Park, MD 20742, USA.
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