Bethe ansatz approach to thermodynamics of superconducting magnetic alloys

Details Bethe ansatz approach to thermodynamics of superconducting magnetic alloys Bethe ansatz approach to thermodynamics of superconducting magnetic alloys

1997-07-02

arxiv.org/abs/cond-mat/9707026v2

Physics

Condensed Matter

Superconductivity

4 pages, RevTex, to appear in PRL

Scientific paper

10.1103/PhysRevLett.80.3368

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.

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