$\pi -0$ Transition in Superconductor-Ferromagnetic-Superconductor Junctions

Abstract

Superconductor-Ferromagnetic-Superconductor (SFS) Josephson junctions are known to exhibit a transition between $\pi$ and 0 states. In this note we find the $\pi -0$ 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 $\pi -0$ 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.

4 pages, 4 figures

References in corpus (1)

• Enhancement of the Josephson current by an exchange field in superconductor-ferromagnet structures

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