New excitations in quantum paraelectrics

被引：27
|
作者：
Courtens, E [1 ]
Hehlen, B [1 ]
Coddens, G [1 ]
Hennion, B [1 ]
机构：
[1] CENS, CEA, CNRS, LAB LEON BRILLOUIN, F-91191 GIF SUR YVETTE, FRANCE
来源：
PHYSICA B-CONDENSED MATTER | 1996年 / 219-20卷
关键词：
D O I：
10.1016/0921-4526(95)00817-9
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Three remarkable anomalies related to the acoustic branches of quantum paraelectric (QPE) oxides are presented. In SrTiO3, an additional shear-like sheet is observed for modes propagating in the tetragonal plane, and shear branches polarized parallel to the tetragonal axis show an anomalous softening on cooling in the QPE-regime. Both in SrTiO3 and KTaO3, a new doublet is observed in Brillouin scattering which is due to second sound, the wave-like propagation of heat. These effects are discussed in terms of large anharmonic polarization clusters.
引用
收藏
页码：577 / 580
页数：4
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