π-0 transition in superconductor-ferromagnet-superconductor junctions

  • N. M. Chtchelkatchev
  • W. Belzig
  • Yu. V. Nazarov
  • C. Bruder
Condensed Matter

Abstract

Superconductor-ferromagnet-superconductor (SFS) Josephson junctions are known to exhibit a transition between π and 0 states. In this letter, 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.

PACS numbers

74.50.+r 74.60.Jg 74.80.−g 

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Copyright information

© MAIK "Nauka/Interperiodica" 2001

Authors and Affiliations

  • N. M. Chtchelkatchev
    • 1
  • W. Belzig
    • 2
  • Yu. V. Nazarov
    • 3
  • C. Bruder
    • 2
  1. 1.Landau Institute for Theoretical PhysicsRussian Academy of SciencesMoscowRussia
  2. 2.Departement Physik und AstronomieUniversität BaselBaselSwitzerland
  3. 3.Department of Applied Physics and Delft Institute of Microelectronics and SubmicrontechnologyDelft University of TechnologyCJ DelftThe Netherlands

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