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.
@article{arxiv.1406.5442,
title = {Evidence for spin-triplet superconducting correlations in metal-oxide heterostructures with non-collinear magnetization},
author = {Yu. N. Khaydukov and G. A. Ovsyannikov and A. E. Sheyerman and K. Y. Constantinian and L. Mustafa and T. Keller and M. A. Uribe-Laverde and Yu. V. Kislinskii and A. V. Shadrin and A. Kalabukhov and B. Keimer and D. Winkler},
journal= {arXiv preprint arXiv:1406.5442},
year = {2014}
}