Tail states in clean superconductors with magnetic impurities
Shytov, A. V. · Vekhter, I. · Gruzberg, I. A. · Balatsky, A. V.
Original · EN
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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