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

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

2001-08-09

arxiv.org/abs/cond-mat/0108165v2

JETP Lett, Vol. 74, 323 (2001) [Pis'ma v Zh. Eksp. i Teor. Fiz. Vol. 74, 357 (2001)]

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1134/1.1421408

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.

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