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Influence of impurity scattering on the critical temperature of superconductors with a partial gap in the electron spectrum

Research paper by A. M. Gabovich, A. S. Shpigel

Indexed on: 01 Jun '83Published on: 01 Jun '83Published in: Journal of low temperature physics



Abstract

The influence of the scattering potential of nonmagnetic and magnetic impurities on the critical superconducting transition temperatureTc is considered for superconductors with either a completely or partially dielectric electron spectrum. It is shown thatTc rises with increasing concentration of nonmagnetic impurities, i.e., the Anderson theorem is violated in such systems. Magnetic impurity scattering lowersTc. However, this reduction is weakened compared to usual superconductors, due to the presence of the dielectric gap on the Fermi surface.