Effect of non-magnetic localized states in superconducting alloys

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Abstract
The authors have calculated in detail the excitation spectrum and superconducting critical temperature for dilute non-magnetic alloys containing transition-metal impurities, the host metal being an isotropic Bardeen-Cooper-Schrieffer superconductor. The localized d states at the impurity sites are considered to affect the superconductivity due to the resonance scattering interaction as proposed by Zuckermann, and the model of Ratto and Blandin is used to take account of the Coulomb repulsion between d electrons of opposite spin. It is shown that these alloys are essentially Bardeen-Cooper- Schrieffer superconductors, with an effective coupling constant which decreases approximately linearly with impurity concentration until the superconductivity is quenched.