Decrease of soft vibrational modes with increasing density of two-level states in the metallic glass Zr-Rh

Authors

  • B. Junge,

    1. Institut für Technische Physik der Technischen Universität Braunschweig, D-38023 Braunschweig, Germany
    Current affiliation:
    1. Forschung-Meßtechnik, Volkswagen AG, D-38436 Wolfsburg
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  • W. Gey

    1. Institut für Technische Physik der Technischen Universität Braunschweig, D-38023 Braunschweig, Germany
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Abstract

Experiments are reported on the specific heat below 1 K of 13 melt quenched ZrRh alloys in the superconducting state (Tc>4.2 K) where electronic degrees of freedom are frozen out. Large differences of the quasilinear (two-level system, TLS) contributions given by λTLS occur with no correlation to the rhodium concentration. The coefficient α of the cubic, phonon-type term is found to decrease with the density of TLS for this metallic glass. This is counter-intuitive to the soft-potential model and differs from the relation found for insulating glasses.

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