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VOLUME 74 | ISSUE 6 | PAGE 357
π-0 transition in superconductor-ferromagnetic-superconductor junctions
N. M. Chtchelkatchev, W. Belzig^\dag, Yu. V. Nazarov*, C. Bruder^\dag

L. D. Landau Institute for Theoretical Physics RAS, 117940 Moscow, Russia
^\dag Departement Physik und Astronomie, Universität Basel, 4056 Basel, Switzerland
*Department of Applied Physics and Delft Institute of Microelectronics and Submicrontechnology, Delft University of Technology, 2628 CJ Delft, The Netherlands


PACS: 74.50.+r, 74.80.-g, 75.70.-i
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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