Magnetic properties of a bilayer system with anisotropic Heisenberg interaction

被引：24

作者：

Balcerzak, T. ^{[1
]}

Luzniak, I. ^{[1
]}

机构：

[1] Univ Lodz, Dept Solid State Phys, PL-90236 Lodz, Poland

来源：

PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS | 2009年 / 388卷 / 04期

关键词：

Cluster variational method; Pair approximation; Anisotropic Heisenberg model; Magnetic properties; Bilayer system; CLUSTER VARIATION METHOD; PHASE-DIAGRAM; CRYSTAL-FIELD; MONTE-CARLO; ISING-MODEL; XXZ MODEL; SPIN; FERROMAGNET; APPROXIMATION; SUSCEPTIBILITY;

D O I：

10.1016/j.physa.2008.10.015

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A magnetic bilayer system with spin S = 1/2, the coordination number z = 5 and anisotropic Heisenberg ferromagnetic interactions, is studied by the Cluster Variational Method in the Pair Approximation. Within this approximation the self-consistent thermodynamic description based on Gibbs free-energy is presented. All relevant thermodynamic properties such as the spontaneous magnetization, pair correlation function. entropy, isothermal susceptibility and magnetic specific heat are calculated. In particular, the analytical expression for the phase transition temperature vs. anisotropy is obtained. The influence of anisotropy on all the thermal characteristics is presented in the figures and discussed. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：357 / 369

页数：13

共 60 条

[1]

[Anonymous], THEORY APPL CLUSTER

[2]

[Anonymous], 1935, Proc. R. Soc. A, DOI DOI 10.1098/RSPA.1935.0122

[3]

[Anonymous], PHYS STATUS SOLIDI B

[4] Study of the crossover from 2 to 3 dimensions in the quantum spin-1/2 anisotropic Heisenberg model [J].

Araújo, IG ;

de Sousa, JR ;

Branco, NS .

PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS, 2002, 305 (3-4) :585-596

[5] Thermodynamics of the Ising model in pair approximation [J].

Balcerzak, T .

PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS, 2003, 317 (1-2) :213-226

[6] RENORMALIZATION TRANSFORMATIONS FOR QUANTUM SPIN SYSTEMS [J].

BROWER, RC ;

KUTTNER, F ;

NAUENBERG, M ;

SUBBARAO, K .

PHYSICAL REVIEW LETTERS, 1977, 38 (22) :1231-1234

[7] FERROMAGNETIC AND ANTIFERROMAGNETIC CURIE TEMPERATURES [J].

BROWN, HA ;

LUTTINGER, JM .

PHYSICAL REVIEW, 1955, 100 (02) :685-692

[8] CLUSTER-VARIATION APPROACH TO THE SPIN-1/2 XXZ MODEL [J].

BUKMAN, DJ ;

AN, GZ ;

VANLEEUWEN, JMJ .

PHYSICAL REVIEW B, 1991, 43 (16) :13352-13364

[9] SPECTRAL-DENSITY METHOD FOR CLASSICAL-SYSTEMS - HEISENBERG-FERROMAGNET [J].

CAMPANA, LS ;

DAURIA, AC ;

DAMBROSIO, M ;

ESPOSITO, U ;

DECESARE, L ;

KAMIENIARZ, G .

PHYSICAL REVIEW B, 1984, 30 (05) :2769-2775

[10]

Canová L, 2008, ACTA PHYS POL A, V113, P449

← 1 2 3 4 5 6 →