Connection between the low temperature acoustic properties and the glass transition temperature of fluoride glasses
- 1 January 1983
- journal article
- Published by EDP Sciences in Journal de Physique
- Vol. 44 (1) , 101-107
- https://doi.org/10.1051/jphys:01983004401010100
Abstract
The variations of the phase velocity and the absorption of longitudinal and transverse acoustic waves of frequencies around 1 GHz have been measured in three fluorozirconate glasses in the temperature range 0.1 K to 1.5 K. The acoustic behaviour at these low temperatures has been ascribed to the existence of two-level systems (TLS). From the measurements, the TLS spectral density and the TLS-phonon coupling constants have been determined. The TLS spectral density has been found to be inversely proportional to the glass transition temperature T g. The TLS-phonon coupling constants vary linearly with T gKeywords
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