PHONON INTERACTIONS IN CRYSTALS.
Abstract
The role of four-phonon processes in the decay of high energy phonons from the lowest (transverse) phonon branch is discussed. The effects of both the quartic anharmonic interaction, as well as the cubic anharmonic interaction calculated in the second Born approximation are included. A comparison of the four-phonon decay rate with the three-phonon decay calculated by Orbach and Vredevoe shows that both processes are very small at low temperatures, whereas at intermediate temperatures the three-and four-phonon decay rates are comparable in magnitude, with the four-phonon rate being proportional to omega sq x T to the 5th power in the high frequency region. Results of an improved calculation of acoustic attenuation in insulators are presented. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1966
- Accession Number
- AD0479347
Entities
People
- M. Pomerantz
- N. S. Shiren
- P. B. Miller
- R. J. Von Gutfeld
Organizations
- IBM Thomas J. Watson Research Center