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Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki, 2002, Volume 75, Issue 12, Pages 772–776
(Mi jetpl3143)
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This article is cited in 18 scientific papers (total in 18 papers)
CONDENSED MATTER
Josephson effect in S$_{\rm F}$XS$_{\rm F}$ junctions
N. M. Chtchelkatcheva, W. Belzigb, C. Bruderb a L. D. Landau Institute for Theoretical Physics, Russian Academy of Sciences
b Departement Physik und Astronomie, Universität Basel
Abstract:
We investigate the Josephson effect in S$_{\rm F}$XS$_{\rm F}$ junctions, where S$_{\rm F}$ is a superconducting material with a ferromagnetic exchange field, and X 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 S$_{\rm F}$IS$_{\rm F}$ junction with collinear orientations of the two exchange fields, and the AC supercurrent amplitude in an SIS tunnel junction. The difference of the exchange fields $h_1-h_2$ in an S$_{\rm F}$IS$_{\rm F}$ junction corresponds to the potential difference $V_1-V_2$ in an SIS junction; i.e., the singularity in $I_c$ [in an S$_{\rm F}$IS$_{\rm F}$ junction] at $|h_1-h_2|=\Delta_1+\Delta_2$ is the analogue of the Riedel peak. We also discuss the AC Josephson effect in S$_{\rm F}$IS$_{\rm F}$ junctions.
Received: 16.05.2002
Citation:
N. M. Chtchelkatchev, W. Belzig, C. Bruder, “Josephson effect in S$_{\rm F}$XS$_{\rm F}$ junctions”, Pis'ma v Zh. Èksper. Teoret. Fiz., 75:12 (2002), 772–776; JETP Letters, 75:12 (2002), 646–650
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