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Etude de propriétés thermodynamiques de structures hybrides métal normal ou ferromagnétique / supraconducteur

Abstract : We have investigated the orbital magnetism of a ballistic hybrid normal-superconductor ring. We have obtained the flux dependent excitation spectrum for arbitrary normal and superconductor lenghts. We have introduced a new method to evaluate the current harmonics. We have described the cross-over from the\, $h/e$-periodic persistent current to the\, $h/2e$-periodic Josephson current. In a second study, we have calculated the effect of intrinsic ordinary reflexion on the Josephson current in a ballistic superconductor-ferromagnetic-superconductor. The spectrum is strongly modified by gap openings but the current and the $0-\pi$ transition are only slightly modified up to very high spin polarisation. In a third study, we analyse the contain of some solutions of Usadel equation. The standard perturbation theory dressed by cooperons enables us to interpret those solutions in terms of diffusive paths connecting Andreev reflexion events.
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https://tel.archives-ouvertes.fr/tel-00008723
Contributor : Jérôme Cayssol <>
Submitted on : Tuesday, March 8, 2005 - 4:03:27 PM
Last modification on : Wednesday, October 14, 2020 - 4:00:19 AM
Long-term archiving on: : Friday, September 14, 2012 - 11:55:24 AM

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  • HAL Id : tel-00008723, version 1

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Jérôme Cayssol. Etude de propriétés thermodynamiques de structures hybrides métal normal ou ferromagnétique / supraconducteur. Matière Condensée [cond-mat]. Université Paris-Diderot - Paris VII, 2003. Français. ⟨tel-00008723⟩

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