Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 33: Superconductivity, Measuring Devices, Matter at Low Temperature: Poster Session
TT 33.65: Poster
Mittwoch, 28. März 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. Tagirov1,4 — 1Institut 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].
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