Coupling of Two Superconductors through a Ferromagnet: Evidence for a � Junction

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Ryazanov, V.V. and Oboznov, V.V. and Rusanov, A. Yu. and Veretennikov, A.V. and Golubov, A.A. and Aarts, J. (2001) Coupling of Two Superconductors through a Ferromagnet: Evidence for a � Junction. Physical Review Letters, 86 (11). pp. 2427-2430. ISSN 0031-9007

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Abstract:We report measurements of the temperature dependence of the critical current, Ic, in Josephson junctions consisting of conventional superconducting banks of Nb and a weakly ferromagnetic interlayer of a CuxNi1-x alloy, with x around 0.5. With decreasing temperature Ic generally increases, but for specific thicknesses of the ferromagnetic interlayer, a maximum is found followed by a strong decrease down to zero, after which Ic rises again. Such a sharp cusp can be explained only by assuming that the junction changes from a 0-phase state at high temperatures to a � phase state at low temperatures.
Item Type:Article
Copyright:© 2001 American Institute of Physics
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Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/61271
Official URL:http://dx.doi.org/10.1103/PhysRevLett.86.2427
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Metis ID: 201139