Volume 65, Number 1, January 2004
|Page(s)||96 - 102|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 December 2003|
What is the value of the superconducting gap of a F/S/F trilayer?
Centre de Recherches sur les Très Basses Températures (CRTBT (UPR 5001 du CNRS, Laboratoire conventionné avec l'Université Joseph Fourier.) ), CNRS BP 166, 38042 Grenoble Cedex 9, France
2 Laboratoire d'Etude des Propriétés Electroniques des Solides (LEPES (UPR 0011 du CNRS, Laboratoire conventionné avec l'Université Joseph Fourier.) ), CNRS BP 166, 38042 Grenoble Cedex 9, France
Corresponding author: firstname.lastname@example.org
Accepted: 24 October 2003
Based on the model of F/S/F trilayer with atomic thickness (see Buzdin A. and Daumens M., cond-mat/0305320, Europhys. Lett., 64 (2003) 510) we discuss the relative roles of pair-breaking and proximity effects, as a function of the exchange field, of disorder and of a finite thickness in the superconducting layer. The exchange field can be small (weak ferromagnets) or large (strong ferromagnets) compared to the superconducting gap. With weak ferromagnets we show the existence of a re-entrant superconducting gap for the F/S/F trilayer with atomic thickness in the parallel alignment (equivalent to the F/S bilayer). Qualitatively small disorder is equivalent to reducing the value of the hopping parameters. In the presence of a finite thickness in the superconducting layer, the superconducting gap in the antiparallel alignment is larger than in the parallel alignment, meaning that pair breaking dominates over the proximity effect.
PACS: 74.50.+r – Tunneling phenomena; point contacts, weak links, Josephson effects / 74.78.Fk – Multilayers, superlattices, heterostructures
© EDP Sciences, 2004
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