2003/07/16 by Klaus Halterman, Oriol T. Valls · 1 citation
Physics and Astronomy · #Magnetic properties of thin films #Physics of Superconductivity and Magnetism #Theoretical and Computational Physics #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.69.014517
published as Phys. Rev. B 69, 014517 (2004) · 12 pages, 10 Figures
arxiv created 2003/07/16 · openalex publication_date 2004/01/30 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We investigate clean mutilayered structures of the SFS and SFSFS type (where the S layer is intrinsically superconducting and the F layer is ferromagnetic), at low temperature, through numerical solution of the self-consistent Bogoliubov--de Gennes equations for these systems. We obtain results for the pair amplitude, the local density of states, and the local magnetic moment. We find that as a function of the thickness dF of the magnetic layers separating adjacent superconductors, the ground state energy varies periodically between two stable states. The first state is an ordinary ``0 state,'' in which the order parameter has a phase difference of zero between consecutive S layers, and the second is a ``\ensuremathπ state,'' where the sign alternates, corresponding to a phase difference of \ensuremathπ between adjacent S layers. This behavior can be understood from simple arguments. The density of states and the local magnetic moment also reflect this periodicity.