| Numéro |
J. Phys. Colloques
Volume 42, Numéro C6, Décembre 1981
International Conference on Phonon Physics
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|
|---|---|---|
| Page(s) | C6-99 - C6-101 | |
| DOI | https://doi.org/10.1051/jphyscol:1981631 | |
International Conference on Phonon Physics
J. Phys. Colloques 42 (1981) C6-99-C6-101
DOI: 10.1051/jphyscol:1981631
Instituto Venezolano de Investigaciones Científicas (IVIC) , Physics Center, P.O. Box 1827, Caracas 1010A, Venezuela
J. Phys. Colloques 42 (1981) C6-99-C6-101
DOI: 10.1051/jphyscol:1981631
FREQUENCY DEPENDENCE OF ACOUSTIC SATURATION IN SMOKY QUARTZ
R. Nava et M. RodríguezInstituto Venezolano de Investigaciones Científicas (IVIC) , Physics Center, P.O. Box 1827, Caracas 1010A, Venezuela
Abstract
High frequency ultrasonic measurements were performed in gamma irradiated natural quartz at 1.2 K at frequencies down to 20 MHz as a function of applied power. The two-level systems resonant attenuation shows saturation effects which decrease notably at frequencies below 200 MHz. These results are consistent with a decreasing density of states at frequencies close to Ɗ0.