Dresden 2009 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 10: Superconductivity: Tunneling, Josephson Junctions, SQUIDs
TT 10.7: Talk
Monday, March 23, 2009, 15:45–16:00, HSZ 105
A universal 0-π transition in magnetic triplet superconductor Josephson junctions — •Philip Brydon1 and Dirk Manske2 — 1Technische Universität Dresden, Dresden, Germany — 2Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
The spin of the Cooper pair in a triplet superconductor provides a new degree of freedom in Josephson junction physics. This can be accessed by using a magnetically-active tunneling barrier, leading to a rich variety of unconventional Josephson effects. Using a tunneling Hamiltonian approach, we obtain the currents in an arbitrary triplet superconductor – ferromagnet – triplet superconductor junction, imposing only the condition that the orbital pairing states in the two superconductors are not orthogonal. From this, we predict a sign change of the charge current (a 0-π transition) as the orientation of the barrier magnetic moment is varied. We also show that the spin current flows in opposite directions on either side of the junction, and has a phase-independent contribution arising from spin-flip reflection processes. We confirm our results for three different choices of orbital pairing states using Bogoliubov-de Gennes theory.