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Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 33: Superconductivity, Measuring Devices, Matter at Low Temperature: Poster Session

TT 33.65: Poster

Wednesday, March 28, 2012, 15:00–19:00, Poster B

Long-range triplet pairing in superconductor-ferromagnet proximity effect heterostructures — •V. Zdravkov1,2, J. Kehrle1, G. Obermeier1, D. Lenk1, H.-A. Krug von Nidda1, C. Müller1, M.Yu. Kupriyanov3, A.S. Sidorenko2, S. Horn1, R. Tidecks1, and L.R. Tagirov1,41Institut für Physik, Universität Augsburg, D-86159 Augsburg, Germany — 2Institute of Electronic Engineering and Nanotechnologies ASM, Kishinev MD-2028, Moldova — 3Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow 119992, Russia — 4Solid State Physics Department, Kazan Federal University, 420008 Kazan, Russia

For superconductor-ferromagnet (S-F) heterostructures with two or more F-layers, the generation of a long-range, odd-in-frequency triplet pairing at non-collinear (NOC) alignment of the F-layers magnetizations is predicted [1]. Here, we report on the first experimental observation of the triplet pairing in a Nb/Cu41Ni59/Nb/Co/CoOx spin-valve type proximity effect heterostructure, where a very thin Nb layer between the F materials acts as a normal conducting spacer. Measuring the resistance of the samples as a function of an external magnetic field, we observed a sequence of transitions through normal conducting (NC) and superconducting (SC) phases, when the system goes along the magnetic hysteresis loop. The scenario found during the NOC regime is consistent with the theoretical picture of the singlet superconductivity suppression by the long-range triplet pairing generation [2].
F.S. Bergeret, et al. Rev. Mod. Phys. 77, 1321 (2005).
Ya.V. Fominov, et al. JETP Lett. 91, 308 (2010).

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