SOFT MODE INDUCED STRUCTURAL INSTABILITIES

被引：2
|
作者：
BUSSMANNHOLDER, A
机构：
[1] Max-Planck-Institut für Festkörperforschung, D-7000 Stuttgart 80
来源：
FERROELECTRICS | 1992年 / 136卷 / 1-4期
关键词：
SOFT MODES; ELECTRON-PHONON INTERACTIONS;
D O I：
10.1080/00150199208016063
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Structural instabilities and especially those which are related to polar instabilities and ferroelectric phase transitions are investigated within a modified phi4-model. Instead of describing these types of phase transitions within a rigid ion model with anharmonic ion-ion interactions the electronic degrees of freedom are seriously taken into account and shown to renormalize the temperature dependence of the soft mode frequency. Using a self-consistent phonon approximation quantitative agreement of theoretical calculations with experimental data is achieved for the temperature dependences of soft modes and related quantities.
引用
收藏
页码：27 / 31
页数：5
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