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Low Temperature Specific Heat Studies of Molybdenum-Ruthenium Based Superconducting Metallic Glasses


Hopkins, Stuart Thomas (1983) Low Temperature Specific Heat Studies of Molybdenum-Ruthenium Based Superconducting Metallic Glasses. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/TJRF-S955.


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 short-range 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:
  • Johnson, William Lewis (chair)
  • Nicolet, Marc-Aurele
  • Goodstein, David L.
  • McGill, Thomas C.
  • Vreeland, Thad
Defense Date:20 September 1982
Non-Caltech Author Email:stuart.hopkins (AT)
Funding AgencyGrant Number
Natural Sciences and Engineering Research Council of Canada UNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
Record Number:CaltechETD:etd-10102002-125642
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:4007
Deposited By: Imported from ETD-db
Deposited On:10 Oct 2002
Last Modified:20 Dec 2019 19:49

Thesis Files

PDF (Stuart_TH_1983.pdf) - Final Version
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