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 (5)

• Inhomogeneous order-parameter suppression in disordered d-wave superconductors
• Tail States in a Superconductor with Magnetic Impurities
• Superconductors with Magnetic Impurities: Instantons and Sub-gap States
• On the Lifshitz tail in the density of states of a superconductor with magnetic impurities
• Effect of Time Reversal Symmetry Breaking on the Density of States in Small Superconducting Grains

Cited by in corpus (6)

• Inhomogeneous superconductivity and the "pseudogap state of novel superconductors
• Subgap states in dirty superconductors and their effect on dephasing in Josephson qubits
• Statistics of subgap states in $s_{\pm }$ superconductors
• Subgap states in disordered superconductors with strong magnetic impurities
• Quantum-classical transitions in Lifshits tails with magnetic fields
• Mesoscopic variations of local density of states in disordered superconductors