Dresden 2006 – scientific programme

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TT: Tiefe Temperaturen

TT 11: Superconductivity: Heterostructures, Andreev Scattering, Proximity Effect, Coexistence

TT 11.9: Talk

Tuesday, March 28, 2006, 11:45–12:00, HSZ 301

Re-entrant superconductivity in Nb/Cu_xNi_1−x bilayers — •V. Zdravkov^1,2, A. Sidorenko^1,2, G. Obermeier¹, S. Gsell¹, M. Schreck¹, C. Müller¹, S. Horn¹, R. Tidecks¹, and L. Tagirov³ — ¹Institut für Physik, Universität Augsburg, D-86135 Augsburg — ²Institute of Applied Physics, LISES ASM, Kishinev 2028 Moldova — ³Laboratory of Theoretical Physics, Kazan State University, Kazan, Russia

The first pronounced experimental observation of the re-entrant phenomenon in superconductor/ferromagnet Nb/Cu_0.4Ni_0.6 bilayers is reported. A non-monotonous dependence of the superconducting critical temperature T_c is observed, strongly depending on the ferromagnet layer thickness, with a complete disappearance of superconductivity for a narrow range of F-layer thicknesses.

The observation is a manifestation of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) - like state and can be described by a theoretical model, based on the modified SF-boundary conditions [1].

[1] Sidorenko, A.S., Zdravkov, V.I., Prepelitsa, A.A., Helbig, C., Luo, Y., Gsell, S., Schreck, M., Klimm, S., Horn, S., Tagirov, L.R., and Tidecks, R. (2003) Oscillations of the critical temperature in superconducting Nb/Ni bilayers, Ann.Phys.(Leipzig) 12, 37-50.