Study of the first-order transition in the spin-1 Blume-Capel model by using effective-field theory

被引：32

作者：

Costabile, Emanuel ^{[1
]}

Amazonas, Marcio A. ^{[1
,2
]}

Roberto Viana, J. ^{[1
]}

Ricardo de Sousa, J. ^{[1
,3
]}

机构：

[1] Univ Fed Amazonas, Dept Fis, BR-69077000 Manaus, Amazonas, Brazil

[2] Inst Fed Educ Ciencia & Tecnol Amazonas, BR-69020120 Manaus, Amazonas, Brazil

[3] Univ Fed Amazonas, Natl Inst Sci & Technol Complex Syst, BR-69077000 Manaus, Amazonas, Brazil

来源：

PHYSICS LETTERS A | 2012年 / 376卷 / 45期

关键词：

ISING-MODEL; PHASE-DIAGRAMS; REENTRANT BEHAVIOR; DIPOLAR; SYSTEM;

D O I：

10.1016/j.physleta.2012.09.003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The spin-1 Blume-Capel model on a square lattice is studied by using an effective-field theory (EFT) with correlation. We propose an expression for the free energy within the EFT. The phase diagram is constructed in the temperature (T) and single-ion anisotropy amplitude (D) plane. The first-order transition line is obtained by Maxwell construction (comparison between free energies). Our results predict first-order transitions at low temperatures and large anisotropy strengths, which correspond in the phase diagram to the existence of a tricritical point (TCP). We compare our results with mean-field approximation (MFA), that show a qualitative correct behavior for the phase diagram. Crown Copyright (C) 2012 Published by Elsevier B.V. All rights reserved.

引用

页码：2922 / 2925

页数：4

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