Phase transitions in a spin-1 model with plaquette interaction on the square lattice

被引：20
|
作者：
Buzano, C
Evangelista, LR
Pelizzola, A
机构：
[1] IST NAZL FIS MAT, I-10129 TURIN, ITALY
[2] UNIV ESTADUAL MARINGA, DEPT FIS, BR-5790 MARINGA, PARANA, BRAZIL
来源：
PHYSICAL REVIEW B | 1996年 / 53卷 / 22期
关键词：
D O I：
10.1103/PhysRevB.53.15063
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
An extension of the Blume-Emery-Griffiths model with a plaquette four-spin interaction term, on the square lattice, is investigated by means of the cluster variation method in the square approximation. The ground state of the model, for negative plaquette interaction, exhibits several new phases, including frustrated ones. At finite temperature we obtain a quite rich phase diagram with two new phases, a ferrimagnetic and a weakly ferromagnetic one, and several multicritical points.
引用
收藏
页码：15063 / 15070
页数：8
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