Measurements of the attenuation of high frequency ( approximately 100 GHz) phonons in copper and in superconducting aluminium are described. The phonons are generated and detected by means of superconducting tunnel junctions; a brief analysis of this novel experimental technique is included. The attenuation lengths observed are of the same order as, but rather less than, values calculated using free electron theory. The role played by elastic phonon scattering in determining the attenuation length is considered, and some measurements of the phonon propagation through granular copper presented. These can be explained in terms of the interaction of elastic and inelastic phonon scattering.
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A. R. Long (1973) studied this question.
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