VietNam 2013 

IXth Rencontres du Vietnam
Quy-Nhon, August 4-10, 2013


 Nanophysics: from fundamentals to applications

(the return)


Wednesday 7

› 15:00 - 15:20 (20min)
Superharmonic Josephson relation through a long diffusive ferromagnetic bilayer
Caroline Richard  1@  , Manuel Houzet  1@  , Julia Meyer  1@  
1 : Service de Physique Statistique, Magnétisme et Supraconductivité  (SPSMS)  -  Website
17 rue des Martyrs 38054 Grenoble Cedex 9 -  France

The superconducting proximity effect in a homogeneous ferromagnet is short-range due to the dephasing of electrons with opposite spins that is induced by the ferromagnetic exchange field. In contrast, for a non-colinear magnetic configuration, a long-range proximity effect can be generated in the triplet channels with parallel electron spins, as no such dephasing occurs in that case. Here we predict that this effect can be revealed by measuring the Josephson current through a long ferromagnetic bilayer. For non-colinear magnetizations, we find that the current-phase relation is dominated by its second harmonic, which corresponds to the long-range coherent propagation of two triplet pairs of electrons. The pi-periodic Josephson relation can be viewed as the minimal coupling that can exist between the conventional even superconductor in one lead and the effectively odd-frequency superconductor generated by the long-range triplet proximity effect at the extremity of the ferromagnetic bilayer attached to the other lead.

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