INVESTIGATION OF SUPERCONDUCTING TRANSITI ON USING THE ANDERSON-HUBBARD MODEL

Within the two-orbital Hubbard model, the formulas are derived for a s pectrum of fermion excitations in the energy bands hybridized by the A nderson interaction. Using the Hubbards operators diagonalizing the on e-node part of Hamiltonian made it possible to take into account the i nternodal hopping term by means of Green's temperature functions when studying the superconducting properties of the model. Based on conside ration of the low-lying part of the energy spectrum, a formula has bee n obtained for the superconducting transition temperature T-c resultin g from the paired quasiparticles in one of the correlated bands. The d ependence of T-c upon the electron concentration and energy parameters defining intratomic correlations is studied. A conclusion has been ma de regarding applicability of the model considered to describe organic superconductors.