Liu J, Schmalian J, Trivedi N. Pairing and superconductivity driven by strong quasiparticle renormalization in two-dimensional organic charge transfer salts.
PHYSICAL REVIEW LETTERS 2005;
94:127003. [PMID:
15903952 DOI:
10.1103/physrevlett.94.127003]
[Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2004] [Indexed: 05/02/2023]
Abstract
We introduce and analyze a variational wave function for quasi-two-dimensional kappa-(ET)(2) organic salts containing strong local and nonlocal correlation effects. We find an unconventional superconducting ground state for intermediate charge carrier interaction, sandwiched between a conventional metal at weak coupling and a spin liquid at larger coupling. Most remarkably, the excitation spectrum is dramatically renormalized and is found to be the driving force for the formation of the unusual superconducting state.
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