Spontaneous Decay of High-Frequency Acoustic Phonons in Ca
- 9 November 1981
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 47 (19) , 1403-1407
- https://doi.org/10.1103/physrevlett.47.1403
Abstract
The decay of high-frequency acoustic phonons in Ca at low crystal temperature is studied with use of an optical technique of tunable phonon detection. A strongly frequency-dependent lifetime is found for phonons at frequencies Hz. The lifetime decreases proportionally to , indicating spontaneous phonon decay by anharmonic three-phonon processes. These results suggest that nonlinear elasticity theory is applicable to describe anharmonic interactions of high-frequency acoustic phonons.
Keywords
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