Frustrated Heisenberg antiferromagnet on the pyrochlore lattice

被引：52

作者：

Koga, A ^{[1
]}

Kawakami, N ^{[1
]}

机构：

[1] Osaka Univ, Dept Appl Phys, Suita, Osaka 5650871, Japan

来源：

PHYSICAL REVIEW B | 2001年 / 63卷 / 14期

关键词：

D O I：

10.1103/PhysRevB.63.144432

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We investigate quantum phase transitions for the s=1/2 antiferromagnetic Heisenberg model on the pyrochlore lattice. By means of the series expansion method starting from isolated tetrahedra, the ground-state phase diagram is determined. When the ratio of the two competing exchange couplings is varied, a first-order (second-order) quantum phase transition occurs between two spin gap phases (the spin-gap and the antiferromagnetic phases). We also discuss some properties expected for the s=1 pyrochlore spin system.

引用

页数：5

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