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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. Zdravkov^1,2, 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. Tagirov^1,4 — 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/CoO_x 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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