The lattice dynamics of LaMnO3:: the role of the orbital degrees of freedom

被引：2

作者：

Nikiforov, AE ^{[1
]}

Popov, SE ^{[1
]}

机构：

[1] Ural State Univ, Ekaterinburg 620083, Russia

来源：

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING | 2002年 / 74卷 / Suppl 1期

关键词：

Jahn-Teller effect - Lanthanum manganites - Linear electron-lattice constant - Pairwise interionic interaction potential - Shell model;

D O I：

10.1007/s003390201767

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The lattice dynamics of regular LaMnO3 is calculated within a shell model with pairwise interionic interaction potentials and with a Jahn-Teller (JT) contribution included in the energy and the dynamical matrix of the crystal. A correlation is made between Raman spectral lines and lattice vibrations. The positions of some lines in the Raman spectrum are found to depend heavily on the linear JT coupling constant V-e The effect of the JT coupling on the phonon dispersion of the LO mode in the Delta Brillouin-zone direction is investigated. A comparison with experiments is carried out.

引用

页码：S1743 / S1745

页数：3