Gap States in Dilute Magnetic Alloy Superconductors
Woonki Chung, Mark Jarrell
DOI 10.1103/PhysRevLett.77.3621 · Physical Review Letters
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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 T0≲Tc0 and T0≳Tc0 ( T0: Kondo temperature; Tc0: 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 T0/Tc0 and the concentration of the impurities.
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