Odd triplet superconductivity in a superconductor/ferromagnet structure with a spiral magnetic structure
Abstract
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 LRTC for conical ferromagnets. Its spatial dependence undergoes a qualitative change as a function of the cone angle \theta. At small angles the LRTC decays in the ferromagnet exponentially in a monotonic way. If the angle \theta exceeds a certain value, the exponential decay of the LRTC is accompanied by oscillations with a period that depends on \theta. This oscillatory behaviour 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 LRTC decays over the length which is determined by the wave vector of the magnetic spiral and by the exchange field.
Keywords
Cite
@article{arxiv.cond-mat/0602522,
title = {Odd triplet superconductivity in a superconductor/ferromagnet structure with a spiral magnetic structure},
author = {A. F. Volkov and A. Anishchanka and K. B Efetov},
journal= {arXiv preprint arXiv:cond-mat/0602522},
year = {2009}
}
Comments
15 pages, 4 figures; to be published in Phys. Rev. B 73 (10) (2006)