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| VOLUME 90 (2009) | ISSUE 2 | PAGE 149 |
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Quasi-One-Dimensional Fulde-Ferel-Larkin-Ovchinnikov-Like State in Nb/Cu0.41Ni0.59 Bilayers
A. S. Sidorenko+*, V. I. Zdravkov+*, J. Kehrle*, R. Morari+, G. Obermeier*, S. Gsell*, M. Schreck*, C. Müller*, M. Yu. Kupriyanov
 , V. V. Ryazanov∇, S. Horn*, L. R. Tagirov , R. Tidecks*+Institute of Electronic Engineering and Industrial Technologies ASM, MD2028 Kishinev, Moldova *Institut für Physik, Universität Augsburg, D-86159 Augsburg, Germany Institute of Nuclear Physics, Moscow State University, 119992 Moscow, Russia∇Institute for Solid State Physics RAS, 132432 Chernogolovka, Russia  Solid State Physics Department, Kazan State University, 420008 Kazan, Russia
PACS: 74.45.+c, 74.62.-c, 74.78.Na
Abstract
In a ferromagnet (F) being in contact with a superconductor (S) an unconventional finite-momentum pairing of electrons forming Cooper pairs occurs. As a consequence, interference effects of the pairing wave function, leading to an oscillation of the critical temperature for increasing F-layer thickness in S/F bilayers, including extinction and recovery of the superconducting state, were predicted by theory. We observed experimentally all types of this behavior, calculated theoretically, in Nb/Cu1-xNix bilayers (x=0.59) of nanometer film thickness, prepared by magnetron sputtering (utilizing a moving magnetron deposition technique to provide a superb homogeneity of the ultrathin Nb layers), including a double extinction of superconductivity, giving evidence for a multiple reentrant state. |