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Phonon Scattering in Amorphous Solids

  • Robert O. Pohl

Abstract

The thermal conductivity of all amorphous dielectric solids shows a most remarkable uniformity which appears to be insensitive to the host and to chemical impurities. This is demonstrated in Fig. 1 in which the conductivities of all amorphous dielectric solids measured to-date are summarized (1,2). To within less than a factor of 10, the conductivity Λ depends solely on the temperature and not on the material, it has a plateau in the temperature region around 10K, and below 1K approaches a power low Λ ∝Tδ where δ falls into the range 1.8 < δ < 2.0. (Note in particular the recent data obtained by Lasjaunias et al (2) extending the temperature range in which this law appears to hold to 0.025K, with δ=1.95). In this lecture, we want to review some of the studies undertaken to understand this remarkable fact.

Keywords

Phonon Scattering Debye Model Amorphous Solid Tunneling State Ultrasonic Absorption 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1976

Authors and Affiliations

  • Robert O. Pohl
    • 1
  1. 1.Laboratory of Atomic and Solid State PhysicsCornell UniversityIthacaUSA

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