J. Phys. Colloques
Volume 42, Numéro C6, Décembre 1981International Conference on Phonon Physics
|Page(s)||C6-867 - C6-869|
J. Phys. Colloques 42 (1981) C6-867-C6-869
ECHO PROPERTIES OF BGO AND CdSJ.O. Fossum, H.J. Aune, K. Fossheim et R.M. Holt
The Norwegian Institute of Technology, 7034 Trondheim-NTH, Norway
A brief discussion is given of the theory of echo generation in insulators and semiconductors. For semiconductors it is shown that ω, 2ω echo generation may occur without dc-field present. In this case the echo amplitude is directly proportional to the electronic conductivity and the applied fields. Experiments in CdS support the predictions. From measurements on BGO it is concluded that interactions with vacancies which is responsible for strong acoustic attenuation at low temperatures, does not contribute in the echo generation.