TEMPERATURE-INDUCED STRUCTURAL PHASE-TRANSITION IN CABR2 STUDIED BY RAMAN-SPECTROSCOPY - REPLY

被引：4

作者：

RAPTIS, C ^{[1
]}

MCGREEVY, RL ^{[1
]}

机构：

[1] UNIV OXFORD,CLARENDON LAB,OXFORD OX1 3PU,ENGLAND

来源：

PHYSICAL REVIEW B | 1991年 / 43卷 / 15期

关键词：

D O I：

10.1103/PhysRevB.43.12668

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

It has been established by the Raman studies of Raptis, McGreevy, and Sequier [Phys. Rev. B 39, 7996 (1989)], and Hahn and Unruh (preceding paper [Phys. Rev. B 43, 12 665 (1991)]) that CaBr2 undergoes a temperature-induced second-order phase transition (D2h --> D4h) associated with a soft mode of the lower-symmetry phase. In our studies, detailed high-resolution Raman measurements (down to a low-frequency limit of 10 cm-1) in CaBr2 and its isomorphous CaCl2 over wide temperature ranges (especially in the case of CaCl2) above T(c) have not revealed any soft-mode behavior, implying that the soft mode is Raman inactive in the higher-symmetry phase. This experimental evidence justifies, on the whole, the assignment of Raman modes made by Raptis, McGreevy, and Seguier, which has been partly disputed by Hahn and Unruh.

引用

页码：12668 / 12669

页数：2

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