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Pairing and Superconductivity Driven by Strong Quasiparticle Renormalization in Two-Dimensional Organic Charge Transfer Salts

2005; American Physical Society; Volume: 94; Issue: 12 Linguagem: Inglês

10.1103/physrevlett.94.127003

1092-0145

Jun Liu, Jörg Schmalian, Nandini Trivedi,

Perovskite Materials and Applications

We introduce and analyze a variational wave function for quasi two-dimensional kappa-ET 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.