ON THE K-DEPENDENCE OF THE HYBRIDIZATION IN 2-BAND SUPERCONDUCTORS

We study the influence of a k-dependent hybridization on superconducti vity of a two-band model, within an extended BCS picture. Considering intraband d-d pairing and using homothetic relations for the bands and for the hybridization we calculate the energies and the gap of the qu asiparticles, the order parameter and the critical temperature T(c). W e verify that T(c) vanishes at a critical hybridization which depends on the ratio of the effective band masses. Numerical results and possi ble applications are also presented.