Magnetic proximity effect at the interface between a cuprate superconductor and an oxide spin valve


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A heterostructure that consists of the YBa2Cu3O7–δ cuprate superconductor and the SrRuO3/La0.7Sr0.3MnO3 ruthenate/manganite spin valve is investigated using SQUID magnetometry, ferromagnetic resonance, and neutron reflectometry. It is shown that a magnetic moment is induced due to the magnetic proximity effect in the superconducting part of the heterostructure, while the magnetic moment in the composite ferromagnetic interlayer is suppressed. The magnetization emerging in the superconductor coincides in order of magnitude with the results of calculations taking into account the induced magnetic moment of Cu atoms because of orbital reconstruction at the interface between the superconductor and the ferromagnet, as well as with the results of the model taking into account the variations in the density of states at a distance on the order of the coherence length in the superconductor. The experimentally obtained characteristic penetration depth of the magnetic moment in the superconductor considerably exceeds the coherence length of the cuprate superconductor, which indicates the predominance of the mechanism of induced magnetic moment of Cu atoms.

作者简介

G. Ovsyannikov

Kotel’nikov Institute of Radio Engineering and Electronics; Chalmers University of Technology

编辑信件的主要联系方式.
Email: gena@hitech.cplire.ru
俄罗斯联邦, Moscow, 125009; Gothenburg, SE-41296

V. Demidov

Kotel’nikov Institute of Radio Engineering and Electronics

Email: gena@hitech.cplire.ru
俄罗斯联邦, Moscow, 125009

Yu. Khaydukov

Max Planck Institute for Solid State Research; Research Institute of Nuclear Physics

Email: gena@hitech.cplire.ru
德国, Stuttgart, D-70569; Moscow, 119991

L. Mustafa

Max Planck Institute for Solid State Research

Email: gena@hitech.cplire.ru
德国, Stuttgart, D-70569

K. Constantinian

Kotel’nikov Institute of Radio Engineering and Electronics

Email: gena@hitech.cplire.ru
俄罗斯联邦, Moscow, 125009

A. Kalabukhov

Chalmers University of Technology; Research Institute of Nuclear Physics

Email: gena@hitech.cplire.ru
瑞典, Gothenburg, SE-41296; Moscow, 119991

D. Winkler

Chalmers University of Technology

Email: gena@hitech.cplire.ru
瑞典, Gothenburg, SE-41296

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