Pairing and superconductivity driven by strong quasiparticle   renormalization in two-dimensional organic charge transfer salts
  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. 
Jun Liu, Joerg Schmalian, and Nandini Trivedi