CAYSSOL, J.; MONTAMBAUX, G.

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CAYSSOL, J.
Centre de physique moléculaire optique et hertzienne [CPMOH]
Laboratoire de Physique des Solides [LPS]

MONTAMBAUX, G.
Laboratoire de Physique des Solides [LPS]

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Physical Review B: Condensed Matter and Materials Physics (1998-2015). 2004, vol. 70, p. 224520

American Physical Society

Resumen en inglés

The stationnary Josephson effect in a clean Superconductor-Ferromagnet-Superconductor junction is revisited for arbitrarily large spin polarizations. The quasiclassical calculation of the supercurrent assumes that the Andreev reflection is complete for all channels. However, De Jong and Beenakker have shown that the Andreev reflection at a clean FS interface is incomplete, due to the exchange interaction in the ferromagnet. Taking into account this incomplete Andreev reflection, we investigate the quasiparticle spectrum, the Josephson current and the $0-\pi$ transition in a ballistic single channel SFS junction. We find that energy gaps open in the phase dependent spectrum. Although the spectrum is strongly modified when the exchange energy increases, the Josephson current and the $0-\pi$ transition are only weakly affected by the incomplete Andreev reflection, except when the exchange energy is close to the Fermi energy.< Leer menos

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Laboratoire Ondes et Matière d'Aquitaine (LOMA) - UMR 5798