Low-Frequency Elastic Loss in Dielectric and Metallic Glasses at Low Temperature

  • H. Tietje
  • M. v. Schickfus
  • E. Gmelin
  • H.-J. Güntherodt
Conference paper
Part of the Springer Series in Solid-State Sciences book series (SSSOL, volume 51)

Abstract

Since a few years it is a well established fact that the low-temperature properties of amorphous dielectrics and metals are largely determined by low-energy tunneling systems [1]. To agree with the observed anomalies in the thermal and acoustic properties, a particular distribution of the parameters of the tunneling centers has been assumed. The tunneling systems are characterized by the asymmetry Δ of the potential wells and by the tunnel splitting Δ0 due to the overlap of the wavefunctions in the two wells. Their coupling to phonons or conduction electrons leads to a relaxation time τ = τ (E, Δ0). The distribution of the parameters Δ and Δ0 can be transformed into a distribution of the relaxation times \( p(E, {\tau ^{ - 1}}) = 1/2\bar p{\tau ^{ - 1}}{(1 - \tau /{\tau _{\min }})^{ - 1/2}}[2] \) , where E=(Δ22)1/2 is the energy of the tunneling center and τmin the shortest relaxation0 time for a given energy reached at Δ0=E. This distribution diverges for τ→τmin and τ→∞, so that for a finite density of states \( n(E) = \int {\bar p} (E, {\tau ^{ - 1}})d{\tau ^{ - 1}} \) some kind of a cutoff has to be introduced for large values of τ or, equivalently, for small values of Δ0. Until now, however, this cutoff value of τwas not known. The time dependence of the specific heat [3] has shown only qualitatively that large values of τ must exist. Based on measurements of the specific heat it has been argued that Δ0, min ≈15 mK [4].

Keywords

Germanium Acoustics 

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References

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Copyright information

© Springer-Verlag Berlin Heidelberg 1984

Authors and Affiliations

  • H. Tietje
    • 1
  • M. v. Schickfus
    • 2
  • E. Gmelin
    • 1
  • H.-J. Güntherodt
    • 3
  1. 1.Max-Planck-Institut für FestkörperforschungStuttgart 80Fed. Rep. of Germany
  2. 2.Institut für Angewandte Physik IIUniversität HeidelbergHeidelbergFed. Rep. of Germany
  3. 3.Institut für PhysikUniversität BaselBaselSchweiz

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