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Quasi-one-dimensional Fulde-Ferrell-Larkin-Ovchinnikov-like state in Nb/Cu0.41Ni0.59 bilayers |
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| Authors: | 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 |
| Affiliation: | 1. Institute of Electronic Engineering and Industrial Technologies ASM, MD2028, Kishinev, Moldova 6. Institute of Nanotechnology, Karlsuhe Institute of Technology, D-76021, Karlsruhe, Germany 2. Institut für Physik, Universit?t Augsburg, D-86159, Augsburg, Germany 3. Institute of Nuclear Physics, Moscow State University, Moscow, 119992, Russia 4. Institute for Solid State Physics, Russian Academy of Sciences, Chernogolovka, 132432, Russia 5. Solid State Physics Department, Kazan State University, Kazan, 420008, Russia |
| 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 ? x Ni x 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. |
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