University of Illinois Urbana-Champaign

Thermodynamics of disordered carbon(1-x)copper(x) and silicon(1-x)gold(x) near the metal-insulator transition

La Madrid, Marissa Alisangco

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Description

Title
Thermodynamics of disordered carbon(1-x)copper(x) and silicon(1-x)gold(x) near the metal-insulator transition
Author(s)
La Madrid, Marissa Alisangco
Issue Date
1990
Doctoral Committee Chair(s)
Mochel, J.M.
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
  • Measurements of the electron-phonon relaxation time are carried out, using both a direct and indirect method, in three dimensional films of C$\sb{1-x}$Cu$\sb x$ and Si$\sb{1-x}$Au$\sb x$ in the temperature range 0.3K-4K. The electron-phonon resistance and thermal boundary resistance are also measured.
  • The directly measured relaxation times for C$\sb{1-x}$Cu$\sb x$ can agree with theoretical predictions if a longitudinal sound speed similar to that of graphite and a longitudinal to transverse speed ratio similar to that of silicate glasses are used. The results for the Si$\sb{1-x}$Au$\sb x$ only qualitatively agree with theory. The measured thermal resistances are in reasonable agreement with other experiments.
  • Comparison of the direct and indirect measurements of the relaxation times reveal that the specific heat coefficient $\gamma$ behaves approximately like $T\sp{-.6}$ in C$\sb{1-x}$Cu$\sb x$ below 1K, in qualitative agreement with current theories describing the behavior of disordered, interacting electrons near the metal-insulator transition.
Type of Resource
text
Permalink
http://hdl.handle.net/2142/21613
Copyright and License Information
Copyright 1990 La Madrid, Marissa Alisangco

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