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Weissman, Michael B. Israeloff, Nathan Eli 2011-05-11T19:34:32Z 2011-05-11T19:34:32Z 10000-01-01 1991 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. Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-05-11T19:34:32Z No. of bitstreams: 1 1991_Israeloff.pdf: 1326720 bytes, checksum: 637ff36d9b38e8ea4aa643e3e71b98a0 (MD5) Made available in DSpace on 2011-05-11T19:34:32Z (GMT). No. of bitstreams: 1 1991_Israeloff.pdf: 1326720 bytes, checksum: 637ff36d9b38e8ea4aa643e3e71b98a0 (MD5) Previous issue date: 1991 Restriction data tranferred 2014-07-01T11:12:51-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-05-11T19:34:32Z Item is restricted indefinitely. Thesis U of I Only 3480319 http://hdl.handle.net/2142/23868 en 1991 Nathan Eli Israeloff electrical resistance spin glass Copper Manganese (CuMn) spin configuration electron quantum interference mesoscopic CuMn Electrical noise study of spin glass dynamics in mesocopic CuMn Dissertation / Thesis text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.