MONTE-CARLO SIMULATION OF DISORDERED 2-DIMENSIONAL ISING SYSTEMS

被引：20

作者：

HEUER, HO

机构：

[1] Theoretische Physik III, Ruhr-Universität Bochum, Bochum 1

来源：

EUROPHYSICS LETTERS | 1991年 / 16卷 / 05期

关键词：

D O I：

10.1209/0295-5075/16/5/016

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report extensive Monte Carlo simulations of the site-disordered 2-dimensional Ising system. For concentrations between p = 0.6 and p = 1.0 (p(c) = 0.59) we have studied the magnetic and caloric properties as well as the cumulants of the magnetization distribution in the critical region. We have found that disorder induces a strong increase of gamma-eff (gamma-max = 2.16 for p = 0.7) in the usual experimental temperature range (T - T(c))/T(c) = 10(-2) divided-by 10(0). Asymptotically near T(c), gamma-approaches the theoretical value gamma = 1.75 independent of the concentration. We propose a model of weakly coupled compact clusters of spins to describe this crossover behaviour of disordered spin systems.

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收藏

页码：503 / 508

页数：6

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