CROSSOVER EFFECTS IN WEAKLY DILUTED N GREATER-THAN-OR-EQUAL-TO 2 ISING ANTIFERROMAGNETS

被引：3

作者：

AHARONY, A

机构：

[1] Raymond and Beverly Sackler Faculty of Exact Sciences, School of Physics and Astronomy, Tel Aviv University, Ramat Aviv

来源：

PHYSICAL REVIEW B | 1991年 / 44卷 / 01期

关键词：

D O I：

10.1103/PhysRevB.44.423

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Fernandez [Phys. Rev. B 38, 6901 (1988)] showed that weak dilution of n greater-than-or-equal-to 2 Ising antiferromagnets generates random anisotropies. It is shown that the corresponding crossover exponent is phi = 2-phi-a - 2 + alpha, where phi-a is the crossover exponent for the nonrandom uniaxial anisotropy and alpha is the specific-heat exponent. Fernandez's Monte Carlo results for n = 2 in two dimensions indicate that in this special case phi-a congruent-to gamma and phi congruent-to gamma - 2-beta. However, the latter result is generally incorrect.

引用

页码：423 / 424

页数：2

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