Bond order from disorder in the planar pyrochlore magnet

被引：55

作者：

Tchernyshyov, O ^{[1
]}

Starykh, OA

Moessner, R

Abanov, AG

机构：

[1] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

[2] Hofstra Univ, Dept Phys & Astron, Hempstead, NY 11549 USA

[3] Ecole Normale Super, CNRS, UMR 8541, Phys Theor Lab, Paris, France

[4] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA

来源：

PHYSICAL REVIEW B | 2003年 / 68卷 / 14期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevB.68.144422

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study magnetic order in the Heisenberg antiferromagnet on the checkerboard lattice, a two-dimensional version of the pyrochlore network with strong geometric frustration. By employing the semiclassical (1/S) expansion we find that quantum fluctuations of spins induce a long-range order that breaks the fourfold rotational symmetry of the lattice. The ordered phase is a valence-bond crystal. We discuss similarities and differences with the extreme quantum case S=1/2 and find a useful phenomenology to describe the bond-ordered phases.

引用

页数：17

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