Reentrant superconducting behavior of the Josephson SFS junction. Evidence for the π-phase state

Ryazanov, V.V. and Veretennikov, A.V. and Oboznov, V.A. and Rusanov, A. Yu. and Larkin, V.A. and Golubov, A.A. and Aarts, J. (2000) Reentrant superconducting behavior of the Josephson SFS junction. Evidence for the π-phase state. Physica C: Superconductivity, 341-348 (Part 3). pp. 1613-1614. ISSN 0921-4534

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Abstract:	Critical supercurrents, Ic in Nb_Cu1−xNix_Nb Josephson SFS junctions with F-layers prepared from ferromagnetic Cu1−xNix alloys have been studied. For value x=0.52 and particular F-layer thickness we have observed Ic(T) oscillations with Ic vanishing for some values of T. We associate this reentrant superconducting behavior with a crossover of the SFS junction from ‘0’- to ‘π’-state that is related to temperature dependence of spatial oscillation period of induced superconducting order parameter in the weak ferromagnet. We argue this is the first experimental evidence of the π-behavior of a Josephson junction, that is the special feature of superconducting pair flow through a ferromagnet predicted for SFS junctions by Bulaevskii, Buzdin et al [1].
Item Type:	Article
Copyright:	© 2000 Elsevier
Faculty:	Science and Technology (TNW)
Research Group:	Low Temperatures - Biomagnetism (LT)
Link to this item:	http://purl.utwente.nl/publications/74265
Official URL:	http://dx.doi.org/10.1016/S0921-4534(00)01476-3
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