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$π-0$ Transition in Superconductor-Ferromagnetic-Superconductor Junctions

N. M. Chtchelkatchev·W. Belzig·Yu. V. Nazarov·C. Bruder
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Abstract

Superconductor-Ferromagnetic-Superconductor (SFS) Josephson junctions are known to exhibit a transition between $π$ and 0 states. In this note we find the $π-0$ phase diagram of an SFS junction depending on the transparency of an intermediate insulating layer (I). We show that in general, the Josephson critical current is nonzero at the $π-0$ transition temperature. Contributions to the current from the two spin channels nearly compensate each other and the first harmonic of the Josephson current as a function of phase difference is suppressed. However, higher harmonics give a nonzero contribution to the supercurrent.

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N. M. Chtchelkatchev, W. Belzig, Yu. V. Nazarov, C. Bruder. 2002-02-27. $π-0$ Transition in Superconductor-Ferromagnetic-Superconductor Junctions. https://doi.org/10.1134/1.1421408

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