Vibration frequency and damping have been measured as a function of temperature in the range 4.5°K–300°K, for lead, copper, aluminum, and silver rods. Damping has been found to reach a maximum near 13 of Debye temperature, owing to a new relaxation effect. Near the absolute zero both damping and frequency changes vanish as a high power of temperature.
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P. G. Bordoni (1954) studied this question.