Josephson effect in S$_{\rm F}$XS$_{\rm F}$ junctions

N. M. Chtchelkatchev; W. Belzig; C. Bruder

doi:10.1134/1.1503330

paper

Josephson effect in S $_{F}$ XS $_{F}$ junctions

arXiv:cond-mat/0205316 · doi:10.1134/1.1503330

Abstract

We investigate the Josephson effect in S $_{F}$ XS $_{F}$ junctions, where S $_{F}$ 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 $_{F}$ IS $_{F}$ 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 $_{F}$ IS $_{F}$ junction corresponds to the potential difference $V_{1} - V_{2}$ in an SIS junction; i.e., the singularity in $I_{c}$ [in an S $_{F}$ IS $_{F}$ junction] at $∣ h_{1} - h_{2} ∣ = Δ_{1} + Δ_{2}$ is the analogue of the Riedel peak. We also discuss the AC Josephson effect in S $_{F}$ IS $_{F}$ junctions.

5 pages, 5 figures

Josephson effect in S $_{F}$ XS $_{F}$ junctions

Abstract

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Josephson effect in S $_{F}$ XS $_{F}$ junctions