HIGH-TEMPERATURE STUDY OF THE RAMAN-ACTIVE PHONON MODES OF YBA2CU3O7-DELTA

被引：11

作者：

FANTINI, S ^{[1
]}

ULIVI, L ^{[1
]}

ZOPPI, M ^{[1
]}

机构：

[1] CNR,IST ELETTR QUANTIST,I-50127 FLORENCE,ITALY

来源：

SOLID STATE COMMUNICATIONS | 1995年 / 93卷 / 06期

关键词：

HIGH T-C SUPERCONDUCTORS; INELASTIC LIGHT SCATTERING;

D O I：

10.1016/0038-1098(94)00821-3

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We have accomplished Raman scattering measurements on a polycrystalline sample of YBCO in the temperature range 25-600 degrees C and in oxygen atmosphere. In the spectra at high temperature, we observe, new vibrational structures at 360, 585, and 605 cm(-1). The usual Raman modes at 335, 440, and 500 cm(-1) showed a trend to broaden and flatten with increasing temperature. We attribute the peaks observed at high temperature to IR-active vibrational modes which become Raman-active as a result of temperature induced disorder in the YBCO unit cell. In this perspective, we discuss how the migration of oxygen atoms might account for the observed phenomena.

引用

页码：519 / 523

页数：5

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