Effects of Gap Anisotropy in Superconductors Containing Paramagnetic Impurities

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Abstract
The effect of the gap anisotropy on the transition temperature of a superconductor containing paramagnetic impurities is calculated by an extension of the theory of Markowitz and Kadanoff. Deviations from the linear decrease of transition temperature with impurity concentration as predicted by Abrikosov and Gorkov will depend on the relative magnitudes of the spin-flip and the no-spin-flip parts of the impurity scattering potential. It is shown that such a deviation should be observable and provide a test of the Abrikosov-Gorkov theory.