On accidental degeneracies of phonons in monatomic cubic crystals
β Scribed by G. Gilat
- Publisher
- Elsevier Science
- Year
- 1969
- Tongue
- English
- Weight
- 230 KB
- Volume
- 7
- Category
- Article
- ISSN
- 0038-1098
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π SIMILAR VOLUMES
We have presented a method for an exact calculation of the two lowest-order, cubic (F3) and quartic (F4), perturbation terms in the Helmholtz free energy (F) of an anharmonic crystal in the high temperature limit. The method is applicable to a nearest-neighbor central force model of a monatomic fcc
## Abstract It is shown that for special directions in piezoelectric cubic crystals Stokes and antiβStokes waves couple anharmonically also with longitudinal phonons. The dispersion functions of the coupled waves can be represented by simple analytic expressions, if the coupling with the antiβStoke