ORDER BY DISORDER IN THE CLASSICAL HEISENBERG KAGOME ANTIFERROMAGNET

被引:205
作者
REIMERS, JN [1 ]
BERLINSKY, AJ [1 ]
机构
[1] MCMASTER UNIV,INST MAT RES,HAMILTON L8S 4M1,ONTARIO,CANADA
来源
PHYSICAL REVIEW B | 1993年 / 48卷 / 13期
关键词
D O I
10.1103/PhysRevB.48.9539
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Antiferromagnetic ordering on a kagome net is frustrated by the geometry of the lattice. The infinite number of classical ground states suggests that the system might not order at zero temperature, even for Heisenberg spins. However, high-temperature series expansions and earlier simulations indicate that this degeneracy is resolved by thermal fluctuations (i.e., order by disorder), suggesting a nine-sublattice coplanar Neel-like ordering of the spins. Coplanar nematic, random three-state Potts, and Neel orderings for the Heisenberg kagome lattice antiferromagnet are investigated with Monte Carlo simulations coupled with state-of-the-art histogram methods for data analysis. We see strong evidence for thermal selection of long-range order with the spin correlations exhibiting algebraic decay, but the low-temperature phases are also seen to posses a chiral domain structure and very short-range chiral correlations. It is argued that the spin correlations are, surprisingly, rather insensitive to this lack of chiral order. Our results are consistent with T = 0 being a critical point for this model system.
引用
收藏
页码:9539 / 9554
页数:16
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