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Gap States in Dilute Magnetic Alloy Superconductors

Woonki Chung·Mark Jarrell
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Abstract

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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Woonki Chung, Mark Jarrell. 1996-07-02. Gap States in Dilute Magnetic Alloy Superconductors. https://doi.org/10.1103/physrevlett.77.3621

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