Universality aspects of the trimodal random-field Ising model

被引：0
作者：
N.G. Fytas
P.E. Theodorakis
I. Georgiou
机构：
[1] Universidad Complutense,Departamento de Física Teórica I
[2] University of Vienna,Faculty of Physics
[3] Vienna University of Technology,Institute for Theoretical Physics and Center for Computational Materials Science
[4] Vienna Computational Materials Laboratory,undefined
来源：
The European Physical Journal B | 2012年 / 85卷
关键词：
Statistical and Nonlinear Physics;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
We investigate the critical properties of the d = 3 random-field Ising model with an equal-weight trimodal distribution at zero temperature. By implementing suitable graph-theoretical algorithms, we compute large ensembles of ground states for several values of the disorder strength h and system sizes up to N = 1283. Using a new approach based on the sample-to-sample fluctuations of the order parameter of the system and proper finite-size scaling techniques we estimate the critical disorder strength hc = 2.747(3) and the critical exponents of the correlation length ν = 1.34(6) and order parameter β = 0.016(4). These estimates place the model into the universality class of the corresponding Gaussian random-field Ising model.
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