VIBRATIONAL PROPERTIES OF COPPER METAGERMANATE (CUGEO3) SINGLE-CRYSTALS

被引：40

作者：

DEVIC, SD ^{[1
]}

KONSTANTINOVIC, MJ ^{[1
]}

POPOVIC, ZV ^{[1
]}

DHALENNE, G ^{[1
]}

REVCOLEVSCHI, A ^{[1
]}

机构：

[1] UNIV PARIS 11, CHIM SOLIDES LAB, F-91405 ORSAY, FRANCE

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 1994年 / 6卷 / 48期

关键词：

D O I：

10.1088/0953-8984/6/48/002

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We present the polarized far-infrared and Raman spectra of CuGeO3 single crystals in the temperature range between 10 and 300 K. Assignations of vibrational modes were performed on the basis of factor-group and normal-coordinate analyses. The frequencies of the infrared-active modes are determined using an oscillator-fitting procedure of reflectivity data. In the Raman-scattering spectra, besides phonon modes, two broad structures at about 500 and 1600 cm-1 are observed. The temperature dependences of the frequency, full width at half maximum (FWHM) and integrated intensities of these modes suggest their magnetic origin. In the temperature range we considered, no evidence of the spin-Peierls-transition contribution to the phonon and magnon spectra is found.

引用

页码：L745 / L753

页数：9

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