Ordering of the antiferromagnetic Heisenberg model on a pyrochlore slab
Ordering of the antiferromagnetic Heisenberg model on a pyrochlore slab
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DOI：
10.1143/jpsj.70.3695
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发表时间：
2001-12-01
影响因子：
1.7
通讯作者：
Kawamura, H
中科院分区：
文献类型：
--
作者：
Arimori, T;Kawamura, H
用蒙特卡罗模拟方法研究了焦绿石板面上二维海森堡反铁磁体几何受挫的排序。该模型有望成为SrCrGaO化合物广泛研究的参考体系。与kagome Heisenberg反铁磁体形成鲜明对比的是，该模型在低温下表现出局部非共面自旋结构，具有非平凡的手性自由度。我们发现在一定条件下，模型在有限温度下表现出与这些手性自由度相关的新颖kosterlitz - thoulless型转变，并讨论了实验意义。
Ordering of the geometrically frustrated two-dimensional Heisenberg antiferromagnet on a pyrochlore slab is studied by Monte Carlo simulations. The model is expected to serve as a reference system of SrCrGaO compound studied extensively. In sharp contrast to the kagome Heisenberg antiferromagnet, the model exhibits locally non-coplanar spin structures at low temperatures, bearing nontrivial chiral degrees of freedom. We find that under certain conditions the model exhibits a novel Kosterlitz-Thouless-type transition at a finite temperature associated with these chiral degrees of freedom, Implications to experiments are discussed.