Application of the generalized constant coupling approximation to the geometrically frustrated antiferromagnets ZnCr2O4 and ZnCr2-2xGa2xO4

被引：11

作者：

García-Adeva, AJ ^{[1
]}

Huber, DL ^{[1
]}

机构：

[1] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA

来源：

PHYSICA B-CONDENSED MATTER | 2002年 / 320卷 / 1-4期

关键词：

geometrical frustration; pyrochlore; Kagome; antiferromagnetism;

D O I：

10.1016/S0921-4526(02)00609-9

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

In this paper, we utilize the quantum version of the generalized constant coupling approximation, which we have extended to include nearest and next-nearest-neighbor interactions, to calculate the magnetic susceptibility of the geometrically frustrated antiferromagnet ZnCr2O4, and its diluted counterpart, ZnCr2-2xGa2xO4. Comparison is made with available experimental results. The existence of a 'spin gap' between the singlet ground state and the triplet excited states is discussed. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：18 / 22

页数：5

共 17 条

[1] SPIN-1/2 HEISENBERG-ANTIFERROMAGNET ON THE KAGOME LATTICE - HIGH-TEMPERATURE EXPANSION AND EXACT-DIAGONALIZATION STUDIES [J].