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

页码：577 / 580

页数：4

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