Observation of Akhiezer and Landau-Rumer Regimes in the Frequency Dependence of Shear-Wave Lattice Attenuation in CdS
- 22 September 1975
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 35 (12) , 792-795
- https://doi.org/10.1103/physrevlett.35.792
Abstract
Brillouin-scattering measurements on acoustoelectrically amplified flux are used to determine the room-temperature frequency dependence of the lattice attenuation of ultrasonic shear waves in CdS up to a frequency of 7 GHz. The results show clearly a transition from the Akhiezer regime to the Landau-Rumer regime. The transition frequency provides an estimate of about 35 psec for the average lifetime of the thermal phonons involved in the ultrasonic attenuation process.
Keywords
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