Electrical noise study of spin glass dynamics in mesoscopic copper manganese
Israeloff, Nathan Eli
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https://hdl.handle.net/2142/18999
Description
Title
Electrical noise study of spin glass dynamics in mesoscopic copper manganese
Author(s)
Israeloff, Nathan Eli
Issue Date
1991
Doctoral Committee Chair(s)
Weissman, Michael B.
Department of Study
Physics
Discipline
Physics
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Physics, Condensed Matter
Language
eng
Abstract
The electrical resistance of the archetypal spin glass $\underline{\rm Cu}$Mn is surprisingly sensitive to small changes in the spin configuration. This enhanced sensitivity results from long-range electron quantum interference at low temperatures. Due to this effect, substantial resistance noise is produced by spontaneous spin fluctuations below the spin-glass freezing transition. Described here are the results of noise experiments on extremely small 'mesoscopic' samples of $\underline{\rm Cu}$Mn. These samples are so small that only a handful of spin fluctuation events are observed during a measurement. Thus we have probed, for the first time, the glassy dynamics with sufficient microscopic detail to uncover the main features of the dynamical pattern. The results are incompatible with the simple 'droplet' picture of spin glasses which is currently in vogue. Noise statistics reveal instead very cooperative dynamics, closely resembling hierarchical dynamics models.
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