Josephson effect in SFXSF junctions

Abstract

We investigate the Josephson effect in SFXSF junctions, where SF is a superconducting material with a ferromagnetic exchange field, and X is a weak link. The critical current I c increases with the (antiparallel) exchange fields, if the distribution of transmission eigenvalues of the X layer has its maximum weight at small values. This exchange-field enhancement of the supercurrent does not exist if X is a diffusive normal metal. At low temperatures, there is a correspondence between the critical current in an SFISF junction with collinear orientations of the two exchange fields, and the AC supercurrent amplitude in an SIS tunnel junction. The difference in the exchange fields h 1-h 2 in an SFISF junction corresponds to the potential difference V 1-V 2 in an SIS junction; i.e., the singularity in I c [in an SFISF junction] at |h 1-h 2|=Δ12 is the analogue of the Riedel peak. We also discuss the AC Josephson effect in SFISF junctions.

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From Pis'ma v Zhurnal Éksperimental'no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Fiziki, Vol. 75, No. 12, 2002, pp. 772–776.

Original English Text Copyright © 2002 by Chtchelkatchev, Belzig, Bruder.

This article was submitted by the authors in English.

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Chtchelkatchev, N.M., Belzig, W. & Bruder, C. Josephson effect in SFXSF junctions. Jetp Lett. 75, 646–650 (2002). https://doi.org/10.1134/1.1503330

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PACS numbers

  • 74.50.+r
  • 74.80.−g
  • 75.70.−I