Random field Ising model in a random graph

被引：8
|
作者：
Doria, F. F. [1 ]
Erichsen, R., Jr. [1 ]
Dominguez, D. [1 ]
Gonzalez, Mario [2 ]
Magalhaes, S. G. [3 ]
机构：
[1] Univ Fed Rio Grande do Sul, Inst Fis, BR-91501970 Porto Alegre, RS, Brazil
[2] Univ Estatal Milagro, Milagro, Guayas, Ecuador
[3] Univ Fed Fluminense, Inst Fis, BR-24210346 Niteroi, RJ, Brazil
来源：
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS | 2015年 / 422卷
关键词：
Disordered systems; Random field Ising model; Finite connectivity; BETHE LATTICE; SPIN-GLASSES; FINITE CONNECTIVITY; TRICRITICAL POINTS; STATE; INSTABILITY; SYMMETRY; SYSTEMS;
D O I：
10.1016/j.physa.2014.12.002
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The Random Field Ising Model (RFIM) following bimodal and Gaussian distributions for the RF is investigated using a finite connectivity technique. We focused on determining the order of the phase transition as well as the existence of a tricritical point as a function of the connectivity c for both types of RF distribution. Our results indicate that for the Gaussian distribution the phase transition is always second-order. For the bimodal distribution, there is indeed a tricritical point. However, its location is strongly dependent on c. The tricritical point is suppressed below a certain minimum value of connectivity. (C) 2015 Elsevier B.V. All rights reserved.
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页码：58 / 65
页数：8
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