Bethe ansatz approach to thermodynamics of superconducting magnetic alloys

Abstract

We derive thermodynamic Bethe ansatz equations for a model describing an $U\to \infty$ Anderson impurity embedded in a BCS superconductor. The equations are solved analytically in the zero-temperature limit, T=0. It is shown that the impurities depress superconductivity in the Kondo limit, however at T=0 the system remains in the superconducting state for any impurity concentration. In the mixed-valence regime, an impurity contribution to the density of states of the system near the Fermi level overcompensates a Cooper pairs weakening, and superconductivity is enhanced.

4 pages, RevTex, to appear in PRL

References in corpus (1)

• Exactly Solvable Model of Superconducting Magnetic Alloys

Cited by in corpus (4)

• Ground State Properties of Anderson Impurity in a Gapless Host
• Kondo screening in gapless magnetic alloys
• Hidden Integrability of a Kondo Impurity in an Unconventional Host
• Exactly solvable toy models of unconventional magnetic alloys: Bethe Ansatz versus Renormalization Group method