Second-order central peak in the Raman spectra of disordered ferroelectrics

被引：9
|
作者：
Vugmeister, BE [1 ]
Yacoby, Y
Toulouse, J
Rabitz, H
机构：
[1] Princeton Univ, Dept Chem, Princeton, NJ 08544 USA
[2] Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel
[3] Lehigh Univ, Dept Phys, Bethlehem, PA 18015 USA
来源：
PHYSICAL REVIEW B | 1999年 / 59卷 / 13期
关键词：
D O I：
10.1103/PhysRevB.59.8602
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A theory of the central peak line shape in Raman scattering in ferroelectrics above T-c is developed. Off-center ions are considered as a possible source of the local symmetry breaking. We argue that in order to properly describe the features of the central peak line shape above T-c one should take into account the second-order invariants in the modulation of the electronic polarizability by polarization fluctuations. The theory is in excellent agreement with the Raman-scattering experiment in KTa1-xNbxO3 [J. P. Sokoloff, L, L. Chase, and L. A. Boatner, Phys. Rev. B 41, 2398 (1990)]. [S0163-1829(99)11213-X].
引用
收藏
页码：8602 / 8606
页数：5
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