Berlin 2008 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 11: Superconductivity: Tunneling, Josephson Junctions, SQUIDs

TT 11.7: Talk

Monday, February 25, 2008, 17:15–17:30, H 3010

Josephson spin currents in triplet superconductor junctions — •Philip Brydon and Dirk Manske — Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany

The interplay of triplet superconductivity and magnetism leads to unconventional Josephson behaviour in junctions combining these two phases. This is shown, for example, by the dependence of the Josephson current on the alignment of the barrier magnetic moment with the bulk superconductor d-vectors in the triplet-superconductor–ferromagnet–triplet-superconductor (TFT) junction studied by P. M. R. Brydon et al. (cond-mat/0709.2918). In general, the Josephson effect between triplet superconductors allows not only for a spontaneous charge current, but also a spontaneous spin current. Using a quasiclassical Green’s function theory, we investigate the spin current through the TFT junction in the ballistic regime. Results for the dependence of the spin current vs phase relations upon the orientation of the two d-vectors and the ferromagnetic moment are presented.