Tail states in clean superconductors with magnetic impurities
A. V. Shytov, I. Vekhter, I. A. Gruzberg, A. V. Balatsky
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 and treating the order parameter self-consistently we show that the density of states is finite everywhere in the superconducting gap, and that it varies as N(E) -|E-Δ0|(7-d)/4 near the mean field gap edge Δ0 in a d-dimensional superconductor. In contrast to most studied cases the optimal fluctuation is strongly anisotropic.
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