Ultrasonic Attenuation in Single-Crystal Aluminum

Abstract
Measurements of the ultrasonic attenuation in single crystals of aluminum as a function of temperature (from 2 to 100°K) and of phonon frequency (from 8 to 24 Mc/sec) are reported. The temperature dependence of the electron mean free path has been determined from these measurements; at temperatures below 25°K, the mean free path shows a T3 dependence, and above 25°K, a T5 dependence.

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