Negative nonlocal resistance in mesoscopic gold Hall bars: Absence of giant spin Hall effect

Autor:	Mihajlovic, G., Pearson, J. E., Garcia, M. A., Bader, S. D., Hoffmann, A.
Rok vydání:	2009
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics Condensed Matter - Materials Science
Zdroj:	Phys. Rev. Lett. 103, 166601 (2009)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevLett.103.166601
Popis:	We report the observation of negative nonlocal resistances in multiterminal mesoscopic gold Hall bar structures whose characteristic dimensions are larger than the electron mean-free path. Our results can only be partially explained by a classical diffusive model of the nonlocal transport, and are not consistent with a recently proposed model based on spin Hall effects. Instead, our analysis suggests that a quasiballistic transport mechanism is responsible for the observed negative nonlocal resistance. Based on the sensitivity of our measurements and the spin Hall effect model, we find an upper limit for the spin Hall angle in gold of 0.022 at 4.5 K. Comment: 4 pages, 5 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0902.3686 Zobrazit plný text záznamu View this record from Arxiv