Gap States in Dilute Magnetic Alloy Superconductors

Details Gap States in Dilute Magnetic Alloy Superconductors Gap States in Dilute Magnetic Alloy Superconductors

1996-07-02

arxiv.org/abs/cond-mat/9607012v1

Physics

Condensed Matter

4 pages in ReVTeX including 4 encapsulated Postscript figures

Scientific paper

10.1103/PhysRevLett.77.3621

We study states in the superconducting gap induced by magnetic impurities using self-consistent quantum Monte Carlo with maximum entropy and formally exact analytic continuation methods. The magnetic impurity susceptibility has different characteristics for $T_{0} \alt T_{c0}$ and $T_{0} \agt T_{c0}$ ($T_{0}$: Kondo temperature, $T_{c0}$: superconducting transition temperature) due to the crossover between a doublet and a singlet ground state. We systematically study the location and the weight of the gap states and the gap parameter as a function of $T_{0}/T_{c0}$ and the concentration of the impurities.

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