We have studied the dependence of the superconducting (SC) transition temperature on the mutual orientation of magnetizations of Fe1 and Fe2 layers in the spin valve system CoO_x/Fe1/Cu/Fe2/Pb. We find that this dependence is nonmonotonic when passing from the parallel to the antiparallel case and reveals a distinct minimum near the orthogonal configuration. The analysis of the data in the framework of the SC triplet spin valve theory gives direct evidence for the long-range triplet superconductivity arising due to noncollinearity of the two magnetizations.
@article{arxiv.1207.0727,
title = {Evidence for Triplet Superconductivity in a Superconductor-Ferromagnet Spin Valve},
author = {P. V. Leksin and N. N. Garif'yanov and I. A. Garifullin and Ya. V. Fominov and J. Schumann and Y. Krupskaya and V. Kataev and O. G. Schmidt and B. Büchner},
journal= {arXiv preprint arXiv:1207.0727},
year = {2012}
}
Comments
5 pages (including 4 EPS figures). Version 2: final version as published in PRL