Local structural anomalies in perovskite-type lattices

被引：8

作者：

Bussmann-Holder, A ^{[1
]}

机构：

[1] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany

来源：

PHYSICA B | 1999年 / 263卷

关键词：

phase transitions; electron-phonon interactions;

D O I：

10.1016/S0921-4526(98)01398-2

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Perovskite oxides show various structural instabilities which are related to ferroelectricity, antiferroelectricity, Jahn-Teller effects, ferromagnetism, charge- and spin-density instabilities. The electronic, spin and lattice instabilities are described within an anharmonic lattice model extended by electron (spin) phonon interactions and higher-order multiphonon density-density interactions. The model yields within the self-consistent phonon approximation (SPA) mode softening at arbitrary q-values, charge and spin ordering. Exact solutions of the nonlinear equations of motion have been obtained numerically and show highly anomalous q-dependences of the ionic displacements. In real space correlated dynamic displacement patterns are obtained which are mostly related to the oxygen ions which define new length and time scales. The results are related to recent local structure studies. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：408 / 411

页数：4

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