FLUCTUATIONS IN THE CURIE-WEISS VERSION OF THE RANDOM FIELD ISING-MODEL

被引：27
作者：
DEMATOS, JMGA
PEREZ, JF
机构：
[1] UNIV HEIDELBERG,SONDERFORSCH BEREICH 123,W-6900 HEIDELBERG 1,GERMANY
[2] UNIV SAO PAULO,INST FIS,BR-01498 SAO PAULO,BRAZIL
来源：
JOURNAL OF STATISTICAL PHYSICS | 1991年 / 62卷 / 3-4期
关键词：
RANDOM FIELD ISING MODEL; NONTRIVIAL FLUCTUATIONS;
D O I：
10.1007/BF01017975
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The fluctuations of the order parameter in the Curie-Weiss version of the Ising model with random magnetic field are computed. Away from criticality or at first-order critical points they have a Gaussian distribution with random (i.e., sample-dependent) mean, thermal fluctuations contributing in same order as the fluctuations of the field; at second- or higher-order critical points, non-Gaussian sample-dependent distributions appear, and the fluctuations of the fields are enhanced, dominating over the thermal ones.
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页码：587 / 608
页数：22
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