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Re-entrant superconductivity in Nb/Cu(1-x)Ni(x) bilayers

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arxiv cond-mat/0602448 v1 pith:RQ24L2OQ submitted 2006-02-19 cond-mat.supr-con cond-mat.mtrl-sci

V. Zdravkov (1) , A. Sidorenko (1) , G. Obermeier (2) , S. Gsell (2) , M. Schreck (2) , C. Müller (2) , S. Horn (2) , R. Tidecks (2)
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L.R. Tagirov (3) ((1) Institute of Applied Physics LISES ASM Kishinev Moldova (2) Institut fuer Physik Universitaet Augsburg Germany (3) Solid State Physics Department Kazan State University Kazan Russia)
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classification cond-mat.supr-concond-mat.mtrl-sci
keywords superconductivitycuniferromagneticlayerincreasingre-entrantsuperconductorthickness
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We report on the first observation of a pronounced re-entrant superconductivity phenomenon in superconductor/ferromagnetic layered systems. The results were obtained using a superconductor/ferromagnetic-alloy bilayer of Nb/Cu(1-x)Ni(x). The superconducting transition temperature T_{c} drops sharply with increasing thickness d_{CuNi} of the ferromagnetic layer, until complete suppression of superconductivity is observed at d_{CuNi}= 4 nm. Increasing the Cu(1-x)Ni(x) layer thickness further, superconductivity reappears at d_{CuNi}=13 nm. Our experiments give evidence for the pairing function oscillations associated with a realization of the quasi-one dimensional Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) like state in the ferromagnetic layer.

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