HEISENBERG AND ISING SPINS IN 3 DIMENSIONS WITH SITE-BOND-CORRELATED DILUTION

被引：11

作者：

BRANCO, NS ^{[1
]}

DEQUEIROZ, SLA ^{[1
]}

DOSSANTOS, RR ^{[1
]}

机构：

[1] PONTIFICIA UNIV CATOLICA RIO DE JANEIRO,DEPT FIS,BR-22452 RIO DE JANEIRO,BRAZIL

来源：

PHYSICAL REVIEW B | 1990年 / 42卷 / 01期

关键词：

D O I：

10.1103/PhysRevB.42.458

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We consider a site-bond correlation model for dilute systems in which the absence of a spin affects the exchange coupling of a nearest-neighbor pair along the line joining the three spins; that is, it acquires the value J, where is a phenomenological parameter [0,1]. Motivated by the experimental phase diagram obtained for KNipMg1-pF3, this model is applied to both Ising and Heisenberg spins in three spatial dimensions. Within a Migdal-Kadanoff approximation, we reproduce the observed upward curvature of the temperature versus concentration diagram. Our results also suggest that the critical exponents are the same as those for uncorrelated dilution. © 1990 The American Physical Society.

引用

页码：458 / 464

页数：7

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