Effect of gap anisotropy in superconductors containing paramagnetic impurities with local states within the gap

The Shiba model for the paramagnetic impurities in a superconductor has been generalized to include the effect of gap anisotropy. The calculated properties are the transition temperatureT_c and the specific heat jump atT_c. The changes brought in these properties by anisotropy are significant.Work supported in part by the Natural Sciences and Engineering Research Council of Canada.