Pairing and superconductivity driven by strong quasiparticle renormalization in two-dimensional organic charge transfer salts

Details Pairing and superconductivity driven by strong quasiparticle renormalization in two-dimensional organic charge transfer salts Pairing and superconductivity driven by strong quasiparticle renormalization in two-dimensional organic charge transfer salts

2004-11-01

arxiv.org/abs/cond-mat/0411044v1

Phys. Rev. Lett. 94, 127003 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.94.127003

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.

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