LATTICE-DYNAMICS OF INCOMMENSURATE CRYSTAL PHASES

被引：59

作者：

JANSSEN, T

机构：

[1] Institute for Theoretical Physics, University of Nijmegen, Nijmegen

来源：

JOURNAL OF PHYSICS C-SOLID STATE PHYSICS | 1979年 / 12卷 / 24期

关键词：

D O I：

10.1088/0022-3719/12/24/010

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The lattice dynamics of incommensurate modulated crystals is discussed in the harmonic approximation. The study is based on the symmetry group of such a crystal, i.e. a superspace group. The normal modes may be characterised by irreducible representations of the symmetry group. It is shown that the relevant representations may be labelled by wave-vectors in the Brillouin zone of the basic space group. The reduction of the equations of motion is treated. Finally selection rules for infrared absorption are derived.

引用

页码：5381 / 5392

页数：12

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