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Title:Universal conductance fluctuations, glassy kinetics, and 1/f noise
Author(s):Garfunkel, Glen Adam
Doctoral Committee Chair(s):Weissman, Michael B.
Department / Program:Physics
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Physics, Condensed Matter
Abstract:The 1/f noise in strongly disordered metallic CCu and SiAu systems was studied in the temperature range 2-300 K. The temperature, frequency, and electric and magnetic field dependencies were found to be consistent with the predictions of the universal conductance fluctuation theory in the low temperature regime.
Statistical properties of the noise in these systems were also studied in specially fabricated nanometer scale samples. Non-Gaussian effects and other aspects of the noise in these samples were used to probe the kinetics of the low energy excitations. In the range 4-30 K ample evidence was found of spectral features and 2 level and 3 level switching events with both tunneling and activated kinetics. This is the first observation of individual low energy excitations in amorphous metallic conductors. The noise in a majority of the systems exhibited anomalous non-Gaussian effects not consistent with a picture of randomly fluctuating independent two level systems.
Issue Date:1989
Rights Information:Copyright 1989 Garfunkel, Glen Adam
Date Available in IDEALS:2011-05-07
Identifier in Online Catalog:AAI8924818
OCLC Identifier:(UMI)AAI8924818

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