π-0 Transition in Superconductor-Ferromagnet-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.
- Publication:
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Soviet Journal of Experimental and Theoretical Physics Letters
- Pub Date:
- September 2001
- DOI:
- 10.1134/1.1421408
- arXiv:
- arXiv:cond-mat/0108165
- Bibcode:
- 2001JETPL..74..323C
- Keywords:
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- Condensed Matter - Mesoscale and Nanoscale Physics
- E-Print:
- 4 pages, 4 figures