Phonon thermal transport in metallic glasses below 100 K
Matey, James Regis
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https://hdl.handle.net/2142/25081
Description
Title
Phonon thermal transport in metallic glasses below 100 K
Author(s)
Matey, James Regis
Issue Date
1978
Doctoral Committee Chair(s)
Anderson, A.C.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
phonon thermal transport
metallic glasses
phonon thermal conductivity
Language
en
Abstract
We have performed measurements of the phonon thermal conductivity of a variety of metallic glasses. In each case, the temperature dependence and magnitude of the phonon thermal conductivity of the glassy metal was very similar to that characteristic of nonmetallic glasses. We also performed variation of sound velocity measurements on a glassy palladium silicon alloy and found qualitative similarity between its behavior and the behavior of nonmetallic glasses. These findings and results from other laboratories have led us to the conclusion that the localized excitations responsible for the anomalous behavior of nonmetallic glasses are also present in the metallic glasses.
We succeeded in manipulating the density of the two-level systems in our PdSi rods by heat treating them. Since the plateau regime and the ~T2 regime in the phonon thermal conductivity were affected in the same way, we concluded that the plateau and the T2 regimes are both caused by the two-level systems. Finally, we made quantitative comparisons between our data and the tunneling-states model of the localized excitations. Since there are large discrepancies, we believe that it is necessary to seek further extensions to the tunneling-states theory.
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