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

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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[...] and of the Debye temperature[...]on metalloid content, and the influence of these parameters on observed properties.[...] 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,[...] 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.

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