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
收藏
页码：S1743 / S1745
页数：3
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