THE HIGH-FREQUENCY ELASTIC CONSTANTS OF SrTiO3 IN THE QUANTUM PARAELECTRIC REGIME

被引:20
作者
Hehlen, B. [1 ]
Kallassy, Z. [1 ]
Courtens, E. [1 ]
机构
[1] Univ Montpellier 2, Associe CNRS, Lab Sci Mat Vitreux, F-34095 Montpellier, France
关键词
D O I
10.1080/00150199608224113
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The velocities of acoustic modes have been measured on SrTiO3 by Brillouin and neutron scattering. Anomalies are detected at, or below T-q, the temperature that marks the onset of the quantum paraelectric regime. It is shown quantitatively that the square of the polarization plays an important role below T-q. The dependence on the wavevector square which is found for some of the anomalies indicates the importance of coupling terms proportional to the gradient of the polarization.
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页码:265 / 272
页数:8
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