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TT: Fachverband Tiefe Temperaturen
TT 30: Superconductivity - Poster Session
TT 30.44: Poster
Montag, 31. März 2014, 15:00–19:00, P2
Long-range spin transport and spin-charge separation in nanoscale superconductors — Michael J. Wolf1, Florian Hübler1,2, Stefan Kolenda1, Hilbert von Löhneysen2,3, and •Detlef Beckmann1 — 1Institut für Nanotechnologie, Karlsruher Institut für Technologie — 2Institut für Festkörperphysik, Karlsruher Institut für Technologie — 3Physikalisches Institut, Karlsruher Institut für Technologie
We report on nonlocal transport in superconductor hybrid structures, with ferromagnetic as well as normal-metal tunnel junctions attached to the superconductor. In the presence of a strong Zeeman splitting of the density of states, we find signatures of spin transport over distances of several µm [1], exceeding other length scales such as the coherence length, the normal-state spin-diffusion length, and the charge-imbalance length [2]. The relaxation length of the spin signal shows a strong increase with magnetic field, hinting at a freeze-out of relaxation by the Zeeman splitting. Using a combination of ferromagnetic and normal-metal contacts, we demonstrate spin injection from a normal metal, and show a complete separation of charge and spin imbalance [3].
Hübler et al., Phys. Rev. Lett. 109, 207001 (2012)
Hübler et al., Phys. Rev. B 81, 184524 (2010)
Wolf et al., Phys. Rev. B 87, 024517 (2013)