Dielectric spectroscopy on organic charge-transfer salts

4 J ul 2 00 6 1 Strong electronic correlations in superconducting organic charge transfer salts

We review the role of strong electronic correlations in quasi–twodimensional organic charge transfer salts such as (BEDT-TTF)2X, (BETS)2Y and β′-[Pd(dmit)2]2Z. We begin by defining minimal models for these materials. It is necessary to identify two classes of material: the first class is strongly dimerised and is described by a half-filled Hubbard model; the second class is not strongly dimeris...

Strong correlations in organic charge transfer salts: superconductors, Mott insulators, bad metals and spin liquids

Surface characterization and surface electronic structure of organic quasi-one- dimensional charge transfer salts

Ff-IR absorption spectroscopy of BEDT-TfF radical salts: charge transfer and donor-anion interaction

IR absorption spectra from various K-phases of BEDT·TfF radical cation salts as well as from a-(BEDT·TIFhI, arc presented. From tbese spectra one special mode l'n representing the asymmetric ring C-C stretching vibration is assigned and the dependence of its frequency from the average charge on the donor molecule is given. The investigation of the metal-insulator phase transition of a-(BEDT·TrF...

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)(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 spect...