Josephson coupling through a magnetic impurity

A. V. Rozhkov, Daniel P. Arovas

Research output: Contribution to journalArticlepeer-review

139 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)2788-2791
Number of pages4
JournalPhysical Review Letters
Issue number13
Publication statusPublished - 1999
Externally publishedYes


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