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Superconducting current in hybrid structures with an antiferromagnetic interlayer

Zaitsev, A. V. and Ovsyannikov, G. A. and Constantinian, K. Y. and Kislinskiĭ, Yu. V. and Shadrin, A. V. and Borisenko, I. V. and Komissinskiy, P. V. (2010):
Superconducting current in hybrid structures with an antiferromagnetic interlayer.
In: Journal of Experimental and Theoretical Physics, Springer, pp. 336-344, 110, (2), ISSN 1063-7761, [Online-Edition: http://dx.doi.org/10.1134/S1063776110020172],
[Article]

Abstract

It is shown experimentally that the superconducting current density in Nb/Au/Ca1 − x Sr x CuO2/YBa2Cu3O7 − δ hybrid superconducting heterostructures with a Ca1 − x Sr x CuO2 anti-ferromagnetic (AF) cuprate interlayer is anomalously high for interlayer thicknesses d M = 10–50 nm and the characteristic damping length for superconducting correlations is on the order of 10 nm. The experimental results are explained on the basis of theoretical analysis of a junction of two superconductors (S′ and S) connected by a magnetic multilayer with the AF ordering of magnetization in the layers. It is shown that with such a magnetization ordering, anomalous proximity effect determined by the singlet component of the condensate wavefunction may take place. As a result, the critical currents in S′/I/AF/S and S′/I/N/S structures (I denotes an insulator, and N, the normal metal) may coincide in order of magnitude even when the thickness of the AF interlayer considerably exceeds the decay length of the condensate wavefunction in ferromagnetic layers.

Item Type: Article
Erschienen: 2010
Creators: Zaitsev, A. V. and Ovsyannikov, G. A. and Constantinian, K. Y. and Kislinskiĭ, Yu. V. and Shadrin, A. V. and Borisenko, I. V. and Komissinskiy, P. V.
Title: Superconducting current in hybrid structures with an antiferromagnetic interlayer
Language: English
Abstract:

It is shown experimentally that the superconducting current density in Nb/Au/Ca1 − x Sr x CuO2/YBa2Cu3O7 − δ hybrid superconducting heterostructures with a Ca1 − x Sr x CuO2 anti-ferromagnetic (AF) cuprate interlayer is anomalously high for interlayer thicknesses d M = 10–50 nm and the characteristic damping length for superconducting correlations is on the order of 10 nm. The experimental results are explained on the basis of theoretical analysis of a junction of two superconductors (S′ and S) connected by a magnetic multilayer with the AF ordering of magnetization in the layers. It is shown that with such a magnetization ordering, anomalous proximity effect determined by the singlet component of the condensate wavefunction may take place. As a result, the critical currents in S′/I/AF/S and S′/I/N/S structures (I denotes an insulator, and N, the normal metal) may coincide in order of magnitude even when the thickness of the AF interlayer considerably exceeds the decay length of the condensate wavefunction in ferromagnetic layers.

Journal or Publication Title: Journal of Experimental and Theoretical Physics
Volume: 110
Number: 2
Publisher: Springer
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Advanced Thin Film Technology
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 30 Mar 2012 08:51
Official URL: http://dx.doi.org/10.1134/S1063776110020172
Identification Number: doi:10.1134/S1063776110020172
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