A discrete two-sublattice model of the lattice instability in A2BX4-type crystals

被引：1

作者：

Janssen, T ^{[1
]}

Ishibashi, Y

机构：

[1] Univ Nijmegen, Nijmegen, Netherlands

[2] Aichi Shukutoku Univ, Sch Commun, Nagakute, Aichi 4801197, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2001年 / 70卷 / 09期

关键词：

two-sublattice model; four-sublattice model; A(2)BX(4)-type crystals; incommensurate phase transitions;

D O I：

10.1143/JPSJ.70.2613

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The discrete four-sublattice model previously proposed for reproducing the lattice instabilities in A(2)BX(4)-type crystals is reduced to a two-sublattice model. Eigenfrequencies and the associated cigenvectors of the, dynamical matrix are given analytically for general k values. The conditions on the interaction parameters for the appearance of incommensurate phase transitions are clarified.

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收藏

页码：2613 / 2615

页数：3

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