Dresden 2006 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 11: Superconductivity: Heterostructures, Andreev Scattering, Proximity Effect, Coexistence

TT 11.6: Vortrag

Dienstag, 28. März 2006, 10:45–11:00, HSZ 301

Odd Triplet Superconductivity in Superconductor/Ferromagnet Structure with a Spiral Magnetic Structure. — •Alexandra Anishchanka — Ruhr-Universität Bochum, Theoretische Physik III, NB 6/23, Universitätsstr. 150, 44801, Bochum

We analyze a superconductor-ferromagnet (S/F) system with a spiral magnetic structure in the ferromagnet F for a weak and strong exchange field. The long-range triplet component (LRTC) penetrating into the ferromagnet over a long distance is calculated for both cases. In the dirty limit (or weak ferromagnetism) we study the LTRC for conical ferromagnets. Its spatial dependence undergoes a qualitative change as function of the cone angle. At angles close to pi/2 the LTRC decays in the ferromagnet exponentially in a monotonic way. If the cone angle exceeds a certain value, the exponential decay of the LTRC is accompanied by oscillations with a period that depends on the cone angle. This oscillatory behavior leads to a similar dependence of the Josephson critical current in SFS junctions on the thickness of the F layer. In the case of a strong ferromagnet the LTRC decays over the length which is determined by the wave vector of the magnetic spiral and the exchange field.