Measurements of the time-dependent specific heat of amorphous materials

M. T. Loponen, R. C. Dynes, V. Narayanamurti, and J. P. Garno
Phys. Rev. B 25, 1161 – Published 15 January 1982
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Abstract

The time dependence of the specific heat of several amorphous materials, such as a-SiO2, a-As2S3, and a-As, has been studied in the temperature range 0.1-1 K. It is found that below 0.3 K in all the materials studied the short-time specific heat at about 10 μsec is considerably smaller than the long-time specific heat, but larger than the Debye value. Above 0.3 K most of the specific heat is coupled to the phonons already at 10 μsec. However, measurements at very long time scales reveal that the specific heat has a component with a logarithmic time dependence, as proposed by the tunneling model, although only part of the total specific heat can be ascribed to it.

  • Received 15 July 1981

DOI:https://doi.org/10.1103/PhysRevB.25.1161

©1982 American Physical Society

Authors & Affiliations

M. T. Loponen, R. C. Dynes, V. Narayanamurti, and J. P. Garno

  • Bell Laboratories, Murray Hill, New Jersey 07974

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Vol. 25, Iss. 2 — 15 January 1982

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