The influence of the s-d(f) coulomb interaction on the transition element compound superconductive critical temperature

Abstract

The influence of s-d Coulomb interaction on the superconductive critical temperature T c of transition element compounds and their dilute alloys was investigated in the frame of Anderson model. Coulomb interaction of electrons with opposite spins on the same atom was considered in a ladder approximation valid when hybridization is sufficiently small while s-d Coulomb interaction has led to the “parquet” summation. It is shown that s-d Coulomb interaction results in the decrease of T c and hence the electron mechanism of superconductivity seems to be noneffective in systems under consideration.