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

G. Mihajlović, J. E. Pearson, M. A. Garcia, S. D. Bader, A. Hoffmann

Research output: Contribution to journalArticlepeer-review

Abstract

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 0.023 at 4.5K.

Original languageEnglish (US)
Article number166601
JournalPhysical review letters
Volume103
Issue number16
DOIs
StatePublished - Oct 14 2009
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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