Strong electron correlations in κ-(BEDT-TTF)2X salts

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Abstract

The κ-ET2X compounds are classified as strongly correlated electron systems. The tight-binding approach for correlated electrons is applied to the κ-ET2X family. The electronic spectrum and density of states are calculated. The singlet superconducting pairing of different symmetries is studied based on the symmetry of the latice model of ET2-layer, and the superconducting coupling constants are calculated. The comparison of the theoretical speculations with available experimental data is made for normal and superconducting phases in κ-ET2X.

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    On leave from: N.S. Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, Leninskii Prospekt 31, 117 907 Moscow, Russia.

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