Random transverse single-ion anisotropy in the spin-1 Blume-Capel quantum model

被引：13

作者：

Salgado, C. M. ^{[1
]}

de Carvalho, N. L. ^{[1
]}

de Arruda, P. H. Z. ^{[1
]}

Godoy, M. ^{[1
]}

de Arruda, A. S. ^{[1
]}

Costabile, Emanuel ^{[2
]}

Ricardo de Sousa, J. ^{[2
,3
]}

机构：

[1] Univ Fed Mato Grosso, Inst Fis, BR-78060900 Cuiaba, MS, Brazil

[2] Univ Fed Amazonas, Inst Fis, BR-78060900 Manaus, Amazonas, Brazil

[3] Natl Inst Sci & Technol Complex Syst, Rua Xavier Sigaud 150, BR-22290180 Rio De Janeiro, RJ, Brazil

来源：

PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS | 2019年 / 522卷

关键词：

Random anisotropy; Blume-Capel model; Phase diagram; DYNAMIC PHASE-DIAGRAMS; EFFECTIVE-FIELD THEORY; CRYSTAL-FIELD; ISING-MODEL; MAGNETIC-FIELD; MONTE-CARLO; TRICRITICAL BEHAVIOR; 1ST-ORDER TRANSITION; TEMPERATURE; DIPOLAR;

D O I：

10.1016/j.physa.2019.01.123

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have studied the effects of the random transverse single-ion anisotropy in the phase diagram and in the thermodynamic properties of the spin-1 Blume-Capel quantum model, which has been used the approach the mean-field theory based on the Bogoliubov inequality for the Gibbs free energy. The phase diagrams were obtained in the temperature tau = k(B)T/zJ versus single-ion anisotropy delta(x) = D-x/zJ plane for several values of delta(y) = D-y/zJ, p and q. The results show that there is a tricritical behavior only in the range of delta(y) given by -0.048 <= delta(y) < 0.5. This behavior is shown again by the curves of the magnetization m as a function of temperature tau with corresponding values of delta(y), p and q. (C) 2019 Elsevier B.V. All rights reserved.

引用

页码：18 / 32

页数：15

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