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0 and π phase Josephson coupling through an insulating barrier with magnetic impurities

O. Vávra, S. Gaži, D. S. Golubović, I. Vávra, J. Dérer, J. Verbeeck, G. Van Tendeloo, and V. V. Moshchalkov
Phys. Rev. B 74, 020502(R) – Published 14 July 2006

Abstract

We have studied the temperature and field dependencies of the critical current IC in the NbFe0.1Si0.9Nb Josephson junction with a tunneling barrier formed by a paramagnetic insulator. We demonstrate that in these junctions coexistence of both the 0 and the π states within one tunnel junction occurs, and leads to the appearance of a sharp cusp in the temperature dependence IC(T), similar to the IC(T) cusp found for the 0π transition in metallic π junctions. This cusp is not related to the 0π temperature-induced transition itself, but is caused by the different temperature dependencies of the opposing 0 and π supercurrents through the barrier.

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  • Received 29 May 2006

DOI:https://doi.org/10.1103/PhysRevB.74.020502

©2006 American Physical Society

Authors & Affiliations

O. Vávra1,2,*, S. Gaži2, D. S. Golubović1, I. Vávra2, J. Dérer2, J. Verbeeck3, G. Van Tendeloo3, and V. V. Moshchalkov1

  • 1Nanoscale Superconductivity and Magnetism Group, INPAC—Institute for Nanoscale Physics and Chemistry, K. U. Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium
  • 2Institute of Electrical Engineering, Slovak Academy of Sciences, Dúbravská cesta 9, SK-841 04 Bratislava, Slovak Republic
  • 3EMAT, University of Antwerp, Groenenborgerlaan 171, B-2020, Antwerp, Belgium

  • *Present address: Institut für experimentelle und angewandte Physik, Universität Regensburg, D-93025 Regensburg, Germany. Electronic address: ondrej.vavra@savba.sk

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Issue

Vol. 74, Iss. 2 — 1 July 2006

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