Superconductivity in a model with overlapping wide and flat bands

The density of one-electron states at the Fermi level with allowance for weak Coulomb correlations between the band electrons is calculated in a superconductivity model having overlapping wide and flat bands. The dependence of the superconducting transition temperature on the doping level is obtained. Fiz. Tverd. Tela (St. Petersburg) 39, 237–239 (February 1997)