Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 33: Superconductivity, Measuring Devices, Matter at Low Temperature: Poster Session
TT 33.62: Poster
Mittwoch, 28. März 2012, 15:00–19:00, Poster B
Long-range spin transport in superconductors — •Detlef Beckmann1, Florian Hübler2, Michael J. Wolf1, and Hilbert von Löhneysen2,3 — 1Institut für Nanotechnologie, Karlsruher Institut für Technologie — 2Institut für Festkörperphysik, Karlsruher Institut für Technologie — 3Physikalisches Institut, Karlsruher Institut für Technologie
Recently, there has been some controversy about spin-polarized quasiparticle transport and relaxation in superconductors, with reports of both anomalously short [1] or anomalously long [2] relaxation times as compared to the normal state. Here, we report on non-local transport in multiterminal superconductor-ferromagnet structures. We find signatures of spin transport over distances much larger than the normal-state spin-diffusion length in the presence of a large Zeeman splitting of the quasiparticle states. The relaxation length shows a nearly linear increase with magnetic field, hinting at a freeze-out of spin relaxation by the Zeeman splitting.
Poli et al., Phys. Rev. Lett. 100, 136601 (2008)
Yang et al., Nature Materials 9, 586 (2010)