The discovery of a large internal-friction peak in amorphous selenium around 30K at 160 MHz is reported. The peak appears on the attenuation of ultrasonic shear waves and is well explained with a distribution of activation energies from 0 to 130K. Moreover, this distribution involves an attenuation law at low temperature which is indeed observed experimentally.
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Duquesne et al. (1980) studied this question.
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