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VOLUME 74 (2001) | ISSUE 6 |
PAGE 357
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π-0 transition in superconductor-ferromagnetic-superconductor junctions
N. M. Chtchelkatchev, W. Belzig , Yu. V. Nazarov*, C. Bruder
L. D. Landau Institute for Theoretical Physics RAS, 117940 Moscow, Russia 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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