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Weissman, Michael B. Alers, Glenn Baldwin 2011-04-27T15:29:19Z 2011-04-27T15:29:19Z 10000-01-01 1991 Two experiments related to 1/f resistance noise will be described in this thesis. The first is measurements of the anelastic piezoresistance in thin films of bismuth, niobium and iron to demonstrate a connection between mechanical anelastic relaxations and electrical 1/f noise from the motion of defects. We have found that the connection between 1/f noise and mechanical relaxation is more complex than was originally believed and depends critically on the relevant electronic and mechanical coupling factors. The broad nature of 1/f noise is due not to a fundamental source but the generally poor quality of thin films. The second experiment exammes resistance changes in mesoscopic samples of the spm glass CuMn. A large sensitivity of the resistance to the relative configuration of spins in the sample was found with a magnitude and temperature dependence in accordance with predictions of universal conductance fluctuations. Predictions of the droplet theory of spin glasses were tested and no evidence was found for chaotic behavior with temperature changes. These results, and others, are more consistent with hierarchical models for the spin glass phase space. Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-04-27T15:29:19Z No. of bitstreams: 1 1991_alers.pdf: 13239949 bytes, checksum: 258e7a7fd484182c0724a090e282096e (MD5) Made available in DSpace on 2011-04-27T15:29:19Z (GMT). No. of bitstreams: 1 1991_alers.pdf: 13239949 bytes, checksum: 258e7a7fd484182c0724a090e282096e (MD5) Previous issue date: 1991 Restriction data tranferred 2014-07-01T11:12:17-05:00 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 2011-04-27T15:29:19Z Item is restricted indefinitely. Thesis U of I Only 3476372 http://hdl.handle.net/2142/18889 en 1991 Glenn Baldwin Alers mechanical relaxations spin glasses 1/f resistance 1/f resistance noise anelastic piezoresistance thin films bismuth thin films niobium thin films iron thin films resistance changes spin glass CuMn Mechanical relaxations, spin glasses and 1/f resistance noise Dissertation / Thesis text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.