Josephson Coupling through a Magnetic Impurity
A. V. Rozhkov, Daniel P. Arovas
DOI 10.1103/PhysRevLett.82.2788 · Physical Review Letters
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Abstract
We analyze nonperturbatively the behavior of a Josephson junction in which two BCS superconductors are coupled through an Anderson impurity. We recover earlier perturbative results which found that a δ=π phase difference is preferred when the impurity is singly occupied and the on-site Coulomb interaction is large. We find a novel intermediate phase in which one of δ=0 and δ=π is stable while the other is metastable, with the energy E(δ) having a kink somewhere in between. As a consequence of the kink, the I−V characteristics of the junction are modified at low voltages.
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