Spin injection and relaxation in a mesoscopic superconductor
2008 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 100, no 13, 136601- p.Article in journal (Refereed) Published
We study spin transport in a superconducting nanowire using a set of closely spaced magnetic tunnel contacts. We observe a giant enhancement of the spin accumulation of up to 5 orders of magnitude on transition into the superconducting state, consistent with the expected changes in the density of states. The spin relaxation length decreases by an order of magnitude from its value in the normal state. These measurements, combined with our theoretical model, allow us to distinguish the individual spin-flip mechanisms present in the transport channel. Our conclusion is that magnetic impurities rather than spin-orbit coupling dominate spin-flip scattering in the superconducting state.
Place, publisher, year, edition, pages
2008. Vol. 100, no 13, 136601- p.
Density (specific gravity); Nanowires; Scattering; Spin dynamics; Density of states; Magnetic tunnel contacts; Superconducting materials
IdentifiersURN: urn:nbn:se:kth:diva-7472DOI: 10.1103/PhysRevLett.100.136601ISI: 000254670300061ScopusID: 2-s2.0-41749096336OAI: oai:DiVA.org:kth-7472DiVA: diva2:12505
QC 20100813. Uppdaterad från Submitted till Published 20100813.2007-09-102007-09-102010-08-13Bibliographically approved