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Low temperature specific heat studies of molybdenum-ruthenium based superconducting metallic glasses

Citation

Hopkins, Stuart Thomas (1983) Low temperature specific heat studies of molybdenum-ruthenium based superconducting metallic glasses. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-10102002-125642

Abstract

Low temperature specific heat measurements have been used to investigate the electronic structure and superconducting properties of metallic glasses based on transition metals Mo and Ru alloyed with metalloids B and Si. An apparatus constructed for making these measurements is described. The results obtained are discussed in terms of the dependence of the density of states at the Fermi level N(εF) and of the Debye temperature θD on metalloid content, and the influence of these parameters on observed properties. N(εF) is shown to reflect the shortrange order of the metal atoms and in Mo-Ru-B alloys, indicates the existence of two distinct amorphous phases. In addition, N(εF) strongly influences the superconductivity and electronic properties of these materials. Alloying with metalloids increases the Debye temperature of the amorphous Mo-Ru phase and thus affects the superconductivity through the dependence of the electron-phonon coupling on average phonon frequency. A comparison with elastic properties shows an anomalous effect in the lattice specific heat commonly observed in insulating glasses.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:Applied Physics
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Applied Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Johnson, William Lewis
Thesis Committee:
  • McGill, Thomas C. (chair)
Defense Date:20 September 1982
Author Email:stuart.hopkins (AT) comcast.net
Record Number:CaltechETD:etd-10102002-125642
Persistent URL:http://resolver.caltech.edu/CaltechETD:etd-10102002-125642
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:4007
Collection:CaltechTHESIS
Deposited By: Imported from ETD-db
Deposited On:10 Oct 2002
Last Modified:10 Feb 2014 23:54

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