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26 April 2024

» arxiv » cond-mat/0606513

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The 0 and the pi phase Josephson coupling through an insulating barrier with magnetic impurities
O. Vavra ; S. Gazi ; D. S. Golubovic ; I. Vavra ; J. Derer ; J. Verbeeck ; G. Van Tendeloo ; V. V. Moshchalkov ;
Date:	20 Jun 2006
Subject:	Superconductivity
Abstract:	We have studied temperature and field dependencies of the critical current $I_{C}$ in the Nb-Fe$_{0.1}$Si$_{0.9}$-Nb Josephson junction with tunneling barrier formed by paramagnetic insulator. We demonstrate that in these junctions the co-existence of both the 0 and the $pi$ states within one tunnel junction takes place which leads to the appearance of a sharp cusp in the temperature dependence $I_{C}(T)$ similar to the $I_{C}(T)$ cusp found for the $0-pi$ transition in metallic $pi$ junctions. This cusp is not related to the $0-pi$ temperature induced transition itself, but is caused by the different temperature dependencies of the opposing 0 and $pi$ supercurrents through the barrier.
Source:	arXiv, cond-mat/0606513
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