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arXiv · 1406.5442

Evidence for spin-triplet superconducting correlations in metal-oxide heterostructures with non-collinear magnetization

Yu. N. Khaydukov·G. A. Ovsyannikov·A. E. Sheyerman·K. Y. Constantinian·L. Mustafa·T. Keller·M. A. Uribe-Laverde·Yu. V. Kislinskii·A. V. Shadrin·A. Kalabukhov·B. Keimer·D. Winkler
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Abstract

Heterostructures composed of ferromagnetic La0.7Sr0.3MnO3, ferromagnetic SrRuO3, and superconducting YBa2Cu3Ox were studied experimentally. Structures of composition Au/La0.7Sr0.3MnO3/SrRuO3/YBa2Cu3Ox were prepared by pulsed laser deposition, and their high quality was confirmed by X-ray diffraction and reflectometry. A non-collinear magnetic state of the heterostructures was revealed by means of SQUID magnetometry and polarized neutron reflectometry. We have further observed superconducting currents in mesa-structures fabricated by deposition of a second superconducting Nb layer on top of the heterostructure, followed by patterning with photolithography and ion-beam etching. Josephson effects observed in these mesa-structures can be explained by the penetration of a triplet component of the superconducting order parameter into the magnetic layers.

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Yu. N. Khaydukov, G. A. Ovsyannikov, A. E. Sheyerman, K. Y. Constantinian, L. Mustafa, T. Keller, M. A. Uribe-Laverde, Yu. V. Kislinskii, A. V. Shadrin, A. Kalabukhov, B. Keimer, D. Winkler. 2014-06-20. Evidence for spin-triplet superconducting correlations in metal-oxide heterostructures with non-collinear magnetization. https://doi.org/10.1103/physrevb.90.035130

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