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Gauvin-Ndiaye C, Setrakian M, Tremblay AMS. Resilient Fermi Liquid and Strength of Correlations near an Antiferromagnetic Quantum Critical Point. PHYSICAL REVIEW LETTERS 2022; 128:087001. [PMID: 35275692 DOI: 10.1103/physrevlett.128.087001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Revised: 11/15/2021] [Accepted: 01/25/2022] [Indexed: 06/14/2023]
Abstract
Near the antiferromagnetic quantum critical point (QCP) of electron-doped cuprate superconductors, angle-resolved photoemission experiments detect hot spots where the Fermi surface disappears. Here, we demonstrate, using the two-particle self-consistent theory, that in the antinodal region the Fermi liquid remains stable for a broad range of angles on the Fermi surface and for all dopings near the QCP. We show how the quasiparticle weight Z and effective mass m^{*} change and then abruptly become meaningless as the hot spots are approached. We propose a dimensionless number, easily accessible in ARPES experiments, that can be used to gauge the strength of correlations.
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Affiliation(s)
- C Gauvin-Ndiaye
- Département de Physique, Institut quantique, and RQMP Université de Sherbrooke, Sherbrooke, Québec J1K 2R1, Canada
| | - M Setrakian
- Département de Physique, Institut quantique, and RQMP Université de Sherbrooke, Sherbrooke, Québec J1K 2R1, Canada
| | - A-M S Tremblay
- Département de Physique, Institut quantique, and RQMP Université de Sherbrooke, Sherbrooke, Québec J1K 2R1, Canada
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Tian D, Winter SM, Mailman A, Wong JWL, Yong W, Yamaguchi H, Jia Y, Tse JS, Desgreniers S, Secco RA, Julian SR, Jin C, Mito M, Ohishi Y, Oakley RT. The metallic state in neutral radical conductors: dimensionality, pressure and multiple orbital effects. J Am Chem Soc 2015; 137:14136-48. [PMID: 26513125 DOI: 10.1021/jacs.5b08254] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Pressure-induced changes in the solid-state structures and transport properties of three oxobenzene-bridged bisdithiazolyl radicals 2 (R = H, F, Ph) over the range 0-15 GPa are described. All three materials experience compression of their π-stacked architecture, be it (i) 1D ABABAB π-stack (R = Ph), (ii) quasi-1D slipped π-stack (R = H), or (iii) 2D brick-wall π-stack (R = F). While R = H undergoes two structural phase transitions, neither of R = F, Ph display any phase change. All three radicals order as spin-canted antiferromagnets, but spin-canted ordering is lost at pressures <1.5 GPa. At room temperature, their electrical conductivity increases rapidly with pressure, and the thermal activation energy for conduction Eact is eliminated at pressures ranging from ∼3 GPa for R = F to ∼12 GPa for R = Ph, heralding formation of a highly correlated (or bad) metallic state. For R = F, H the pressure-induced Mott insulator to metal conversion has been tracked by measurements of optical conductivity at ambient temperature and electrical resistivity at low temperature. For R = F compression to 6.2 GPa leads to a quasiquadratic temperature dependence of the resistivity over the range 5-300 K, consistent with formation of a 2D Fermi liquid state. DFT band structure calculations suggest that the ease of metallization of these radicals can be ascribed to their multiorbital character. Mixing and overlap of SOMO- and LUMO-based bands affords an increased kinetic energy stabilization of the metallic state relative to a single SOMO-based band system.
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Affiliation(s)
- Di Tian
- Department of Physics, University of Toronto , Toronto, Ontario M5S 1A7 Canada
| | - Stephen M Winter
- Department of Chemistry, University of Waterloo , Waterloo, Ontario N2L 3G1, Canada
| | - Aaron Mailman
- Department of Chemistry, University of Waterloo , Waterloo, Ontario N2L 3G1, Canada
| | - Joanne W L Wong
- Department of Chemistry, University of Waterloo , Waterloo, Ontario N2L 3G1, Canada
| | - Wenjun Yong
- Department of Earth Sciences, University of Western Ontario , London, Ontario N6A 5B7, Canada
| | - Hiroshi Yamaguchi
- Faculty of Engineering, Kyushu Institute of Technology , Kitakyushu 804-8550, Japan
| | - Yating Jia
- Institute of Physics, Chinese Academy of Sciences , Beijing, 100080, China
| | - John S Tse
- Department of Physics, University of Saskatchewan , Saskatoon, Saskatchewan S7N 5E2, Canada
| | - Serge Desgreniers
- Department of Physics, University of Ottawa , Ottawa, Ontario K1N 6N5, Canada
| | - Richard A Secco
- Department of Earth Sciences, University of Western Ontario , London, Ontario N6A 5B7, Canada
| | - Stephen R Julian
- Department of Physics, University of Toronto , Toronto, Ontario M5S 1A7 Canada.,Canadian Institute for Advanced Research , Toronto, Ontario M5G 1Z8, Canada
| | - Changqing Jin
- Institute of Physics, Chinese Academy of Sciences , Beijing, 100080, China
| | - Masaki Mito
- Faculty of Engineering, Kyushu Institute of Technology , Kitakyushu 804-8550, Japan
| | - Yasuo Ohishi
- Materials Science Division, Japan Synchrotron Radiation Research Institute , SPring-8, Sayo, Hyogo 679-5198, Japan
| | - Richard T Oakley
- Department of Chemistry, University of Waterloo , Waterloo, Ontario N2L 3G1, Canada
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Diehl S, Methfessel T, Tutsch U, Müller J, Lang M, Huth M, Jourdan M, Elmers HJ. Disorder-induced gap in the normal density of states of the organic superconductor κ-(BEDT-TTF)2Cu[N(CN)2]Br. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2015; 27:265601. [PMID: 26076168 DOI: 10.1088/0953-8984/27/26/265601] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The local density of states (DOS) of the organic superconductor κ-(BEDT-TTF)2Cu[N(CN)2]Br, measured by scanning tunneling spectroscopy on in situ cleaved surfaces, reveals a logarithmic suppression near the Fermi edge persisting above the critical temperature T(c). The experimentally observed suppression of the DOS is in excellent agreement with a soft Hubbard gap as predicted by the Anderson-Hubbard model for systems with disorder. The electronic disorder also explains the diminished coherence peaks of the quasi-particle DOS below T(c).
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Affiliation(s)
- Sandra Diehl
- Graduate School Materials Science In Mainz, Staudingerweg 9, 55128 Mainz, Germany. Institut für Physik, Johannes Gutenberg-Universität Mainz, Staudingerweg 7, 55128 Mainz, Germany
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