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The Dimer Model for k-phase Organic Superconductors
We prove that the upper electronic bands of k-phase BEDT-TTF salts are
adequately modeled by an half-filled tight-binding lattice with one site per
cell. The band parameters are derived from recent ab-initio calculations,
getting a very simple but extremely accurate one-electron picture. This picture
allows us to solve the BCS gap equation adopting a real-space pairing
potential. Comparison of the calculated superconducting properties with the
experimental data points to isotropic s_0-pairing. Residual many-body or
phonon-mediated interactions offer a plausible explanation of the large variety
of physical properties observed in k-phase BEDT-TTF salts.Comment: 8 pages, 6 PostScript figures, uses RevTe
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