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- URN zum Zitieren dieses Dokuments:
- urn:nbn:de:bvb:355-epub-19705
- DOI zum Zitieren dieses Dokuments:
- 10.5283/epub.1970
Zusammenfassung
Quantitative calculations of phonon lifetimes due to anharmonic three-phonon processes require knowledge of cubic anharmonic coupling coefficients. In order to determine the temperature dependence of phonon frequencies, anharmonic force constants of up to fourth order are needed. In polar crystals, the macroscopic electric field gives rise to nonanalytic terms in these coefficients. It is shown ...
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