THE TEMPERATURE DEPENDENCE OF SOME NORMAL MODES IN STRONTIUM TITANATE
Technical Report
·
OSTI ID:4773789
The frequency wave vector dispersion curves were measured for some of the normal modes in strontium titanate along STA100!. The experiments were performed using a triple axis crystal spectrometer and the constant Q technique. Of particular interest is the temperature dependence of the lowest transverse optical branch, which was studied at two temperatures. The frequencies (units 10/ sup 12/ c/s) at q= 0 are 1.27 plus or minus 0.05 at 90 deg K and 2.73 plus or minus 0.05 at 296 deg K. The dispersion curves have maximum frequencies (4.2 at 9O deg K, 4.4 at 296 deg K) near the middle of the zone; at the zone boundary the frequencies are about 3.5. The anomalous temperature dependence of the q = 0 mode was predicted by Cochran, and the magnitude of the change with temperature, which may be obtained from the temperature dependence of the dielectric constant, is in good agreement with the theory. The non-infrared active mode was observed and has a frequency at q = 0 of 7.95 plus or minus 0.15. (auth)
- Research Organization:
- Atomic Energy of Canada Ltd., Chalk River, Ont.
- NSA Number:
- NSA-16-032171
- OSTI ID:
- 4773789
- Report Number(s):
- AECL-1574
- Country of Publication:
- Canada
- Language:
- English
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