Abstract
At low temperatures, the interaction between thermal phonons and low-energy modes typical of glasses is investigated in the range ℏ ω≃ K B T. The attenuation of 33 GHz hypersounds is lower than 500 dB.cm −1 below 5 K. A maximum of velocity is observed. The logarithmic increase of the velocity gives evidence of a resonant interaction up to 6K, and can be explained on the basis of the model assuming a coupling between phonons and two-level systems in glasses.
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