University of Illinois Urbana-Champaign

Electrical noise study of spin glass dynamics in mesocopic CuMn

Israeloff, Nathan Eli

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https://hdl.handle.net/2142/23868

Description

Title
Electrical noise study of spin glass dynamics in mesocopic CuMn
Author(s)
Israeloff, Nathan Eli
Issue Date
1991
Doctoral Committee Chair(s)
Weissman, Michael B.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
  • electrical resistance
  • spin glass
  • Copper Manganese (CuMn)
  • spin configuration
  • electron quantum interference
  • mesoscopic CuMn
Language
en
Abstract
The electrical resistance of the archetypal spin glass CuMn 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 CuMn. 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.
Type of Resource
text
Permalink
http://hdl.handle.net/2142/23868
Copyright and License Information
1991 Nathan Eli Israeloff

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Dissertations and Theses - Physics
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Graduate Theses and Dissertations at Illinois