Classical antiferromagnet on a hyperkagome lattice

被引：57

作者：

Hopkinson, John M.

Isakov, Sergei V.

Kee, Hae-Young

Kim, Yong Baek

机构：

[1] Univ Toronto, Dept Phys, Toronto, ON M5S 1A7, Canada

[2] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 03期

关键词：

D O I：

10.1103/PhysRevLett.99.037201

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Motivated by recent experiments on Na4Ir3O8 [Y. Okamoto, M. Nohara, H. Aruga-Katori, and H. Takagi, arXiv:0705.2821 (unpublished)], we study the classical antiferromagnet on a frustrated three-dimensional lattice obtained by selectively removing one of four sites in each tetrahedron of the pyrochlore lattice. This "hyperkagome" lattice consists of corner-sharing triangles. We present the results of large-N mean field theory and Monte Carlo computations on O(N) classical spin models. It is found that the classical ground states are highly degenerate. Nonetheless a nematic order emerges at low temperatures in the Heisenberg model (N=3) via "order by disorder," representing the dominance of coplanar spin configurations. Implications for ongoing experiments are discussed.

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