OBSERVATION OF THE SILENT SOFT PHONON IN BETA-QUARTZ BY MEANS OF HYPER-RAMAN SCATTERING

被引：45
|
作者：
TEZUKA, Y
SHIN, S
ISHIGAME, M
机构：
[1] Research Institute for Scientific Measurements, Tohoku University, Aoba-ku, Sendai 980
来源：
PHYSICAL REVIEW LETTERS | 1991年 / 66卷 / 18期
关键词：
D O I：
10.1103/PhysRevLett.66.2356
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
By means of hyper-Raman scattering, a silent soft phonon was observed in beta-quartz for the first time. The soft phonon was found to become underdamped at high temperatures. Both the square of the frequency omega-0(2) and the integrated intensity I0 of the soft phonon were found to obey Landau-Cochran's soft-mode theory. The alpha-beta-phase transition of beta-quartz is found to be well described by a simple displacive-type phase transition with the silent soft phonon, in contrast to many studies which suggest an order-disorder phase transition.
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页码：2356 / 2359
页数：4
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