Tail states in clean superconductors with 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 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.

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

References in corpus (1)

• Superconductors with Magnetic Impurities: Instantons and Sub-gap States

Cited by in corpus (6)

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• Quantum-classical transitions in Lifshits tails with magnetic fields
• Mesoscopic variations of local density of states in disordered superconductors