SPIN-PEIERLS TRANSITION IN ALKALI-TCNQ SALTS

被引：34

作者：

TAKAOKA, Y

MOTIZUKI, K

机构：

[1] Department of Material Physics, Faculty of Engineering Science, Osaka University, Toyonaka

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1979年 / 47卷 / 06期

关键词：

D O I：

10.1143/JPSJ.47.1752

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The dimerization phase transition of alkali-TCNQ salts has been studied from the standpoint of the localized electron system. The one-dimensional antiferro-magnetic Heisenberg model is used. In this model the spin-lattice interaction is caused by the modulation of the exchange interaction due to lattice distortion. Within the Hartree-Fock and adiabatic approximations, the displacement, specific heat, and susceptibility are calculated as functions of temperature. The first order phase transition observed in alkali-TCNQ salts is explained by this theory. Finally, the dimerization phase transition of the Ising chain is studied to discuss the effect of the anisotropy of the exchange interaction on the structural phase transition. © 1979, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.

引用

页码：1752 / 1759

页数：8

共 26 条

[1] INSTABILITY OF UNIFORM ANTIFERROMAGNETIC CHAIN .2. HEISENBERG INTERACTION IN HARTREE-FOCK APPROXIMATION [J].