Low Temperature Properties of the Orientationally Disordered Material: Cyanide-Doped Potassium Bromide
Moy, Danny
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https://hdl.handle.net/2142/77364
Description
Title
Low Temperature Properties of the Orientationally Disordered Material: Cyanide-Doped Potassium Bromide
Author(s)
Moy, Danny
Issue Date
1983
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
Low temperature properties of KBr doped with different concentrations of CN have been measured from 0.030K to 10K. The specific heat, thermal conductivity, and dielectric susceptibility are found to vary greatly with the concentration of CN. The concentrations 1%, 3%, 10%, 20%, and 50% CN were studied. For the lowest concentrations, the behavior is similar to that seen in other alkali halide crystals doped with low concentrations of non-interacting impurities. However, as the CN concentration is raised to 10%, a behavior which appears to be similar to that found in amorphous materials and many crystals containing disorder is observed. At a CN concentration of 50%, the behavior is similar to that of an amorphous epoxy. Comparison is made with amorphous materials and with a theory developed by Anderson, Halperin, Varma, and Phillips for two-level-systems in amorphous materials.
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