Tail states in superconductors with weak magnetic impurities
Abstract
We analyse the behavior of the density of states in a singlet s-wave superconductor with weak magnetic impurities in the clean limit by using the method of optimal fluctuation. We show that the density of states varies as N(E) -|E-0|(7-d)/4 near the mean field gap edge 0 in a d-dimensional superconductor. The optimal fluctuation in d>1 is strongly anisotropic. We compare the density of states with that obtained in other recent approaches.
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