Anomalous Sound Velocity in Vitreous Silica at Very Low Temperatures
- 24 June 1974
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 32 (25), 1426-1429
- https://doi.org/10.1103/physrevlett.32.1426
Abstract
The temperature dependence of the longitudinal sound velocity has been measured in vitreous silica between 0.28 and 4.2 K and at frequencies between 30 and 150 MHz. With decreasing temperature the sound velocity does not increase monotonically towards its value at K, but reaches a maximum around 2 K and decreases steadily at lower temperatures. This new result, unique for a pure dielectric solid, gives further evidence for the existence of two-level systems in glasses.
Keywords
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