Tail states in clean superconductors with magnetic impurities

Details Tail states in clean superconductors with magnetic impurities Tail states in clean superconductors with magnetic impurities

2002-06-11

arxiv.org/abs/cond-mat/0206183v2

Phys. Rev. Lett. 90, 147002 (2003)

Physics

Condensed Matter

Superconductivity

4 pages, very minor changes, final version published in PRL

Scientific paper

10.1103/PhysRevLett.90.147002

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 $\ln N(E)\propto -|E-\Delta_0|^{(7-d)/4}$ near the mean field gap edge $\Delta_0$ in a d-dimensional superconductor. In contrast to most studied cases the optimal fluctuation is strongly anisotropic.

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