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Sakakibara H, Kitamine N, Ochi M, Kuroki K. Possible High T_{c} Superconductivity in La_{3}Ni_{2}O_{7} under High Pressure through Manifestation of a Nearly Half-Filled Bilayer Hubbard Model. PHYSICAL REVIEW LETTERS 2024; 132:106002. [PMID: 38518340 DOI: 10.1103/physrevlett.132.106002] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Accepted: 02/07/2024] [Indexed: 03/24/2024]
Abstract
Inspired by a recent experiment showing that La_{3}Ni_{2}O_{7} exhibits high T_{c} superconductivity under high pressure, we theoretically revisit the possibility of superconductivity in this material. We find that superconductivity can take place, which is somewhat similar to that of the bilayer Hubbard model consisting of the Ni 3d_{3z^{2}-r^{2}} orbitals. Although the coupling with the 3d_{x^{2}-y^{2}} orbitals degrades superconductivity, T_{c} can still be high enough to understand the experiment thanks to the very high T_{c} reached in the bilayer Hubbard model.
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Affiliation(s)
- Hirofumi Sakakibara
- Advanced Mechanical and Electronic System Research Center(AMES), Faculty of Engineering, Tottori University, 4-10 Koyama-cho, Tottori, Tottori 680-8552, Japan
- Computational Condensed Matter Physics Laboratory, RIKEN, Wako, Saitama 351-0198, Japan
| | - Naoya Kitamine
- Department of Physics, Osaka University, 1-1 Machikaneyama-cho, Toyonaka, Osaka 560-0043, Japan
| | - Masayuki Ochi
- Department of Physics, Osaka University, 1-1 Machikaneyama-cho, Toyonaka, Osaka 560-0043, Japan
- Forefront Research Center, Osaka University, 1-1 Machikaneyama-cho, Toyonaka, Osaka 560-0043, Japan
| | - Kazuhiko Kuroki
- Department of Physics, Osaka University, 1-1 Machikaneyama-cho, Toyonaka, Osaka 560-0043, Japan
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Hartke T, Oreg B, Jia N, Zwierlein M. Doublon-Hole Correlations and Fluctuation Thermometry in a Fermi-Hubbard Gas. PHYSICAL REVIEW LETTERS 2020; 125:113601. [PMID: 32975995 DOI: 10.1103/physrevlett.125.113601] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Revised: 07/19/2020] [Accepted: 08/14/2020] [Indexed: 06/11/2023]
Abstract
We report on the single atom and single site-resolved detection of the total density in a cold atom realization of the 2D Fermi-Hubbard model. Fluorescence imaging of doublons is achieved by splitting each lattice site into a double well, thereby separating atom pairs. Full density readout yields a direct measurement of the equation of state, including direct thermometry via the fluctuation-dissipation theorem. Site-resolved density correlations reveal the Pauli hole at low filling, and strong doublon-hole correlations near half filling. These are shown to account for the difference between local and nonlocal density fluctuations in the Mott insulator. Our technique enables the study of atom-resolved charge transport in the Fermi-Hubbard model, the site-resolved observation of molecules, and the creation of bilayer Fermi-Hubbard systems.
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Affiliation(s)
- Thomas Hartke
- Department of Physics, MIT-Harvard Center for Ultracold Atoms, and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Botond Oreg
- Department of Physics, MIT-Harvard Center for Ultracold Atoms, and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Ningyuan Jia
- Department of Physics, MIT-Harvard Center for Ultracold Atoms, and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Martin Zwierlein
- Department of Physics, MIT-Harvard Center for Ultracold Atoms, and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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Koepsell J, Hirthe S, Bourgund D, Sompet P, Vijayan J, Salomon G, Gross C, Bloch I. Robust Bilayer Charge Pumping for Spin- and Density-Resolved Quantum Gas Microscopy. PHYSICAL REVIEW LETTERS 2020; 125:010403. [PMID: 32678648 DOI: 10.1103/physrevlett.125.010403] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Accepted: 06/09/2020] [Indexed: 06/11/2023]
Abstract
Quantum gas microscopy has emerged as a powerful new way to probe quantum many-body systems at the microscopic level. However, layered or efficient spin-resolved readout methods have remained scarce as they impose strong demands on the specific atomic species and constrain the simulated lattice geometry and size. Here we present a novel high-fidelity bilayer readout, which can be used for full spin- and density-resolved quantum gas microscopy of two-dimensional systems with arbitrary geometry. Our technique makes use of an initial Stern-Gerlach splitting into adjacent layers of a highly stable vertical superlattice and subsequent charge pumping to separate the layers by 21 μm. This separation enables independent high-resolution images of each layer. We benchmark our method by spin- and density-resolving two-dimensional Fermi-Hubbard systems. Our technique furthermore enables the access to advanced entropy engineering schemes, spectroscopic methods, or the realization of tunable bilayer systems.
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Affiliation(s)
- Joannis Koepsell
- Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany
- Munich Center for Quantum Science and Technology (MCQST), 80799 München, Germany
| | - Sarah Hirthe
- Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany
- Munich Center for Quantum Science and Technology (MCQST), 80799 München, Germany
| | - Dominik Bourgund
- Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany
- Munich Center for Quantum Science and Technology (MCQST), 80799 München, Germany
| | - Pimonpan Sompet
- Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany
- Munich Center for Quantum Science and Technology (MCQST), 80799 München, Germany
| | - Jayadev Vijayan
- Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany
- Munich Center for Quantum Science and Technology (MCQST), 80799 München, Germany
| | - Guillaume Salomon
- Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany
- Munich Center for Quantum Science and Technology (MCQST), 80799 München, Germany
| | - Christian Gross
- Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany
- Munich Center for Quantum Science and Technology (MCQST), 80799 München, Germany
- Physikalisches Institut, Eberhard Karls Universität Tübingen, 72076 Tübingen, Germany
| | - Immanuel Bloch
- Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany
- Munich Center for Quantum Science and Technology (MCQST), 80799 München, Germany
- Fakultät für Physik, Ludwig-Maximilians-Universität, 80799 München, Germany
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She JH, Lawler MJ, Kim EA. Quantum Spin Liquid Intertwining Nematic and Superconducting Order in Fese. PHYSICAL REVIEW LETTERS 2018; 121:237002. [PMID: 30576170 DOI: 10.1103/physrevlett.121.237002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Revised: 02/19/2018] [Indexed: 06/09/2023]
Abstract
Despite its seemingly simple composition and structure, the pairing mechanism of FeSe remains an open problem due to several striking phenomena. Among them are nematic order without magnetic order, nodeless gap and unusual inelastic neutron spectra with a broad continuum, and gap anisotropy consistent with orbital selection of unknown origin. Here we propose a microscopic description of a nematic quantum spin liquid that reproduces key features of neutron spectra. We then study how the spin fluctuations of the local moments lead to pairing within a spin-fermion model. We find the resulting superconducting order parameter to be nodeless s±d wave within each domain. Further we show that orbital dependent Kondo-like coupling can readily capture observed gap anisotropy. Our prediction calls for inelastic neutron scattering in a detwinned sample.
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Affiliation(s)
- Jian-Huang She
- Department of Physics, Cornell University, Ithaca, New York 14853, USA
| | - Michael J Lawler
- Department of Physics, Cornell University, Ithaca, New York 14853, USA
- Department of physics, Binghamton University, Vestal, New York 13850, USA
- Kavli Institute for Theoretical Physics, Kohn Hall, University of California, Santa Barbara, California 93106-4030, USA
| | - Eun-Ah Kim
- Department of Physics, Cornell University, Ithaca, New York 14853, USA
- Kavli Institute for Theoretical Physics, Kohn Hall, University of California, Santa Barbara, California 93106-4030, USA
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Mishra V, Scalapino DJ, Maier TA. s± pairing near a Lifshitz transition. Sci Rep 2016; 6:32078. [PMID: 27561327 PMCID: PMC4999992 DOI: 10.1038/srep32078] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2016] [Accepted: 08/02/2016] [Indexed: 11/09/2022] Open
Abstract
Observations of robust superconductivity in some of the iron based superconductors in the vicinity of a Lifshitz point where a spin density wave instability is suppressed as the hole band drops below the Fermi energy raise questions for spin-fluctuation theories. Here we discuss spin-fluctuation pairing for a bilayer Hubbard model, which goes through such a Lifshitz transition. We find s± pairing with a transition temperature that peaks beyond the Lifshitz point and a gap function that has essentially the same magnitude but opposite sign on the incipient hole band as it does on the electron band that has a Fermi surface.
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Affiliation(s)
- Vivek Mishra
- Joint Institute of Computational Sciences, University of Tennessee, Knoxville, TN-37996, USA
| | - Douglas J Scalapino
- Department of Physics, University of California, Santa Barbara, CA-93106, USA
| | - Thomas A Maier
- Computer Science and Mathematics Division &Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN-37831, USA
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Stock C, Broholm C, Zhao Y, Demmel F, Kang HJ, Rule KC, Petrovic C. Magnetic field splitting of the spin resonance in CeCoIn5. PHYSICAL REVIEW LETTERS 2012; 109:167207. [PMID: 23215124 DOI: 10.1103/physrevlett.109.167207] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2012] [Indexed: 06/01/2023]
Abstract
Neutron scattering in strong magnetic fields is used to show the spin resonance in superconducting CeCoIn(5) (T(c)=2.3 K) is a doublet. The underdamped resonance (ħΓ=0.069±0.019 meV) Zeeman splits into two modes at E(±)=ħΩ(0)±αμ(B)μ(0)H with α=0.96±0.05. A linear extrapolation of the lower peak reaches zero energy at 11.2±0.5 T, near the critical field for the incommensurate "Q phase." Kenzelmann et al. [Science 321, 1652 (2008)] This, taken with the integrated weight and polarization of the low-energy mode (E(-)), indicates that the Q phase can be interpreted as a Bose condensate of spin excitons.
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Affiliation(s)
- C Stock
- NIST Center for Neutron Research, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA
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Kuroki K, Onari S, Arita R, Usui H, Tanaka Y, Kontani H, Aoki H. Unconventional pairing originating from the disconnected Fermi surfaces of superconducting LaFeAsO1-xFx. PHYSICAL REVIEW LETTERS 2008; 101:087004. [PMID: 18764652 DOI: 10.1103/physrevlett.101.087004] [Citation(s) in RCA: 241] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2008] [Indexed: 05/26/2023]
Abstract
For a newly discovered iron-based high T_{c} superconductor LaFeAsO1-xFx, we have constructed a minimal model, where inclusion of all five Fe d bands is found to be necessary. The random-phase approximation is applied to the model to investigate the origin of superconductivity. We conclude that the multiple spin-fluctuation modes arising from the nesting across the disconnected Fermi surfaces realize an extended s-wave pairing, while d-wave pairing can also be another candidate.
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Affiliation(s)
- Kazuhiko Kuroki
- Department of Applied Physics and Chemistry, The University of Electro -Communications, Chofu, Tokyo 182-8585, Japan
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Bianconi A. Feshbach Shape Resonance in Multiband Superconductivity in Heterostructures. ACTA ACUST UNITED AC 2005. [DOI: 10.1007/s10948-005-0047-5] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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10
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Liechtenstein AI, Gunnarsson O, Andersen OK, Martin RM. Quasiparticle bands and superconductivity in bilayer cuprates. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:12505-12508. [PMID: 9985113 DOI: 10.1103/physrevb.54.12505] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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11
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Nazarenko A, Dagotto E. Hole dispersion and symmetry of the superconducting order parameter for underdoped CuO2 bilayers and the three-dimensional antiferromagnets. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:13158-13166. [PMID: 9985177 DOI: 10.1103/physrevb.54.13158] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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12
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Dahm T, Manske D, Tewordt L. Quasiparticle and spin excitations for two coupled Hubbard planes and comparison with experiments on bilayer YBa2Cu3O6+x. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:6640-6647. [PMID: 9986683 DOI: 10.1103/physrevb.54.6640] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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13
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Radtke RJ, Liechtenstein AI, Yakovenko VM. Antiferromagnetic interactions and the superconducting gap function. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:5137-5140. [PMID: 9984110 DOI: 10.1103/physrevb.53.5137] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Maly J, Liu DZ, Levin K. Superconducting order parameter symmetry in multilayer cuprates. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:6786-6805. [PMID: 9982081 DOI: 10.1103/physrevb.53.6786] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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15
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Ziegler W, Dieterich P, Muramatsu A, Hanke W. Slave-boson study in the SU(2)-invariant representation: Coupled layers in the one-band Hubbard model. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:1231-1239. [PMID: 9983580 DOI: 10.1103/physrevb.53.1231] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Mazin II, Yakovenko VM. Neutron scattering and superconducting order parameter in YBa2Cu3O7. PHYSICAL REVIEW LETTERS 1995; 75:4134-4137. [PMID: 10059823 DOI: 10.1103/physrevlett.75.4134] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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17
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Magnetism and pairing in Hubbard bilayers. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:15540-15546. [PMID: 9978512 DOI: 10.1103/physrevb.51.15540] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Liu DZ, Levin K, Maly J. Superconducting order parameter in bilayer cuprates: Occurrence of pi phase shifts in corner junctions. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:8680-8683. [PMID: 9977500 DOI: 10.1103/physrevb.51.8680] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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19
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Liechtenstein AI, Mazin II, Andersen OK. s-wave superconductivity from an antiferromagnetic spin-fluctuation model for bilayer materials. PHYSICAL REVIEW LETTERS 1995; 74:2303-2306. [PMID: 10057894 DOI: 10.1103/physrevlett.74.2303] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Belinicher VI, Chernyshev AL, Dotsenko AV, Sushkov OP. Hole-hole superconducting pairing in the t-J model induced by spin-wave exchange. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:6076-6084. [PMID: 9979525 DOI: 10.1103/physrevb.51.6076] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Scalettar RT, Cannon JW, Scalapino DJ, Sugar RL. Magnetic and pairing correlations in coupled Hubbard planes. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:13419-13427. [PMID: 9975534 DOI: 10.1103/physrevb.50.13419] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Bankay M, Mali M, Roos J, Brinkmann D. Single-spin fluid, spin gap, and d-wave pairing in YBa2Cu4O8: A NMR and NQR study. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:6416-6425. [PMID: 9977021 DOI: 10.1103/physrevb.50.6416] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Hetzel RE, Hanke W. Pairing correlations in a two-layer Hubbard model. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:4159-4162. [PMID: 9976701 DOI: 10.1103/physrevb.50.4159] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Stern R, Mali M, Mangelschots I, Roos J, Brinkmann D, Genoud J, Graf T, Muller J. Charge-carrier density and interplane coupling in Y2Ba4Cu7O15: A Cu NMR-NQR study. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:426-437. [PMID: 9974559 DOI: 10.1103/physrevb.50.426] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Dahm T, Erdmenger J, Scharnberg K, Rieck CT. Superconducting states from spin-fluctuation mechanisms. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 48:3896-3915. [PMID: 10008839 DOI: 10.1103/physrevb.48.3896] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Li QP, Koltenbah BE, Joynt R. Mixed s-wave and d-wave superconductivity in high-Tc systems. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 48:437-455. [PMID: 10006795 DOI: 10.1103/physrevb.48.437] [Citation(s) in RCA: 75] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Li QP, Joynt R. Nuclear relaxation in the superconducting state of YBa2Cu3O7: Evidence for an s+id state. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:530-533. [PMID: 10004480 DOI: 10.1103/physrevb.47.530] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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