Phase transitions in the anisotropic Ashkin-Teller model

被引：21

作者：

Bekhechi, S ^{[1
]}

Benyoussef, A ^{[1
]}

Elkenz, A ^{[1
]}

Ettaki, B ^{[1
]}

Loulidi, M ^{[1
]}

机构：

[1] Fac Sci, Dept Phys, Lab Magnetisme & Phys Hautes Energies, Rabat, Morocco

来源：

PHYSICA A | 1999年 / 264卷 / 3-4期

关键词：

D O I：

10.1016/S0378-4371(98)00474-9

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

By using mean-field approximation (MFA) and Monte-Carlo (MC) simulations, we have studied the effect of the anisotropy on the phase diagrams of the Ashkin-Teller model (A.T.M.) on a hypercubic lattice. By varying the strength of the anisotropic parameter, partially ordered phases, connected by symmetry, and denoted by [sigma] and [S] appear in all dimensions d > 1 as in the three dimensional isotropic case for antiferromagnetic interactions. The MC simulations reduce the varieties of phase diagrams obtained from MFA to one variety. In d = 2 the phase diagrams present Ising-like phase transitions while in d=3 a first order phase transition and then multicritical points appear. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：503 / 514

页数：12

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