We have for the first time measured the elastic properties (sound velocity and internal friction) of glasses below 1K in the audiofrequency range (∼ 1 KHz). The results obtained are discussed in the frame work of the tunneling model of glasses. The major assumption of the tunneling model regarding tunneling states with long relaxation times has been verified.
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Raychaudhuri et al. (1982) studied this question.
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