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SM ISO690:2012 Experimental observation of the triplet spin-valve effect in a superconductor-ferromagnet heterostructure. In: Physical Review B - Condensed Matter and Materials Physics, 2013, vol. 87, p. 0. ISSN 1098-0121. DOI: https://doi.org/10.1103/PhysRevB.87.144507 |
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Physical Review B - Condensed Matter and Materials Physics | ||||||
Volumul 87 / 2013 / ISSN 1098-0121 /ISSNe 1550-235X | ||||||
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DOI:https://doi.org/10.1103/PhysRevB.87.144507 | ||||||
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The theory of superconductor-ferromagnet heterostructures with two ferromagnetic layers predicts the generation of a long-range, odd-in-frequency triplet pairing at noncollinear alignment (NCA) of the magnetizations of the F layers. This triplet pairing has been detected in a Nb/Cu41Ni 59/normal conducting- (nc-) Nb/Co/CoOx spin-valve-type proximity effect heterostructure, in which a very thin Nb film between the F layers serves as a spacer of nc metal. The resistance of the sample as a function of an external magnetic field shows that for not too high fields, the system is superconducting at a collinear alignment of the Cu41Ni 59 and Co layer magnetic moments but switches to the normal conducting state at a NCA configuration. This indicates that the superconducting transition temperature Tc for NCA is lower than the fixed measuring temperature. The existence of a minimum Tc, at the NCA regime below that one for parallel or antiparallel alignments of the F-layer magnetic moments, is consistent with the theoretical prediction of a singlet superconductivity suppression by the long-range triplet pairing generation. |
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Cuvinte-cheie Josephson Junctions, superconductivity, Proximity effect |
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