2003/03/31 by F. S. Bergeret, A. F. Volkov, K. B. Efetov · 2 citations
Physics and Astronomy · #Advanced Condensed Matter Physics #Physics of Superconductivity and Magnetism #Quantum, superfluid, helium dynamics #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.68.064513
published as Phys. Rev. B 68, 064513 (2003) · 14 pages; 9 figures. Final version, to be published in Phys. Rev. B
arxiv created 2003/07/08 · openalex publication_date 2003/08/25 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/04
We study proximity effects in a multilayered superconductor/ferromagnet (S/F) structure with arbitrary relative directions of the magnetization M. If the magnetizations of different layers are collinear, the superconducting condensate function induced in the F layers has only a singlet component and a triplet one with a zero projection of the total magnetic moment of the Cooper pairs on the M direction. In this case the condensate penetrates the F layers over a short length \ensuremathξJ determined by the exchange energy J. If the magnetizations M are not collinear, the triplet component has, in addition to the zero projection, the projections \ifmmode±\else\textpm\fi1. The latter component is even in the momentum, odd in the Matsubara frequency and penetrates the F layers over a long distance that increases with decreasing temperature and does not depend on J (the spin-orbit interaction limits this length). If the thickness of the F layers is much larger than \ensuremathξJ, the Josephson coupling between neighboring S layers is provided only by the triplet component, so that a new type of superconductivity arises in the transverse direction of the structure. The Josephson critical current is positive (negative) for the case of a positive (negative) chirality of the vector M. We demonstrate that this type of the triplet condensate can be detected also by measuring the density of states in F/S/F structures.