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

Journal Article · Fri Apr 15 00:00:00 EDT 2016 · Journal of Experimental and Theoretical Physics

DOI:https://doi.org/10.1134/S1063776116040063· OSTI ID:22617291

Demidov, V. V. ^[1]; Khaydukov, Yu. N.; Mustafa, L. ^[2]; Constantinian, K. Y. ^[1]; Kalabukhov, A. V.; Winkler, D. ^[3]

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1. Russian Academy of Sciences, Kotel’nikov Institute of Radio Engineering and Electronics (Russian Federation)
2. Max Planck Institute for Solid State Research (Germany)
3. Chalmers University of Technology (Sweden)

A heterostructure that consists of the YBa{sub 2}Cu{sub 3}O{sub 7–δ} cuprate superconductor and the SrRuO{sub 3}/La{sub 0.7}Sr{sub 0.3}MnO{sub 3} 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.

• OSTI ID: 22617291
• Journal Information: Journal of Experimental and Theoretical Physics, Vol. 122, Issue 4; Other Information: Copyright (c) 2016 Pleiades Publishing, Inc.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7761
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARIUM COMPOUNDS
COHERENCE LENGTH
CUPRATES
DENSITY OF STATES
FERROMAGNETIC RESONANCE
HIGH-TC SUPERCONDUCTORS
INTERFACES
LANTHANUM COMPOUNDS
MAGNETIC MOMENTS
MAGNETIZATION
MANGANATES
OXIDES
PENETRATION DEPTH
PROXIMITY EFFECT
RUTHENIUM COMPOUNDS
SPIN
SQUID DEVICES
STRONTIUM COMPOUNDS
YTTRIUM COMPOUNDS