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 $\ln N(E)\propto -|E-{\Delta }_0{|}^{(7-d)/4}$ near the mean field gap edge ${\Delta }_0$ 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.

2 pages, to appear in Proceedings of LT-23; (v2) some affiliations changed

References in corpus (1)

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

Cited by in corpus (2)

• Inhomogeneous superconductivity and the "pseudogap state of novel superconductors
• Subgap states in dirty superconductors and their effect on dephasing in Josephson qubits