LIGHT-SCATTERING STUDY OF THE COUPLED SOFT-OPTIC AND ACOUSTIC MODE IN HEXAGONAL BARIUM-TITANATE

被引：24

作者：

YAMAGUCHI, M ^{[1
]}

WATANABE, M ^{[1
]}

INOUE, K ^{[1
]}

AKISHIGE, Y ^{[1
]}

YAGI, T ^{[1
]}

机构：

[1] SHIMANE UNIV,FAC EDUC,MATSUE,SHIMANE 690,JAPAN

来源：

PHYSICAL REVIEW LETTERS | 1995年 / 75卷 / 07期

关键词：

D O I：

10.1103/PhysRevLett.75.1399

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Low-frequency light scattering spectra of hexagonal barium titanate have been observed in the temperature region from 40 to 300 K. An intense central peak was observed near the phase transition temperature T-0 = 222 K and was assigned to be caused by the coupled soft-optic and acoustic mode. The coupled-mode model has been employed to fit experimental data and gives good agreement with the observed spectra. The omega(0)(2)/Gamma(0) ratio of soft-optic-mode frequency omega(0) and damping constant Gamma(0) and the bilinear coupling constant A exhibit linear dependence on T - T-0 indicating mean-field behavior.

引用

页码：1399 / 1402

页数：4

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