PRESSURE-DEPENDENCE OF RAMAN MODES IN CUO

被引：33

作者：

REIMANN, K

SYASSEN, K

机构：

[1] Max-Planck-Institut für Festkörperforschung, D-7000 Stuttgart 80

来源：

SOLID STATE COMMUNICATIONS | 1990年 / 76卷 / 02期

关键词：

14;

D O I：

10.1016/0038-1098(90)90529-K

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We have measured the Raman modes of CuO at room temperature for pressures up to 34 GPa. The two low-frequency modes at 298 and 345 cm-1 show linear and reversible pressure shifts of 2.7 cm-1/GPa and 2.5 cm-1/GPa. The high-frequency mode at 632 cm-1 exhibits a pronounced nonlinear frequency shift for pressures below 15 GPa and, in addition, a strong hysteresis. This hysteresis is taken as evidence for a structural instability around 10 GPa. In the low-pressure range (P < 8 GPa) the experimental data can be described by a force-constant model. Within this model the nonlinear behavior of the high-frequency mode is related to the pressure-induced change of an internal structural parameter. © 1990.

引用

页码：137 / 140

页数：4

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