Magnetization Step in Spatially Distorted Heisenberg Kagomé Antiferromagnets
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概要
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Motivated by a recent experiment on volborthite, a typical spin–1/2 antiferromagnet with a kagomé lattice structure, we study the magnetization process of a classical Heisenberg model on a spatially distorted kagomé lattice using the Monte Carlo (MC) method. We find a distortion-induced magnetization step at low temperatures and low magnetic fields. The magnitude of this step is given by $\Delta m_{z} = |1 - \alpha|/3\alpha$ at zero temperature, where $\alpha$ denotes the spatial anisotropy in exchange constants. The magnetization step signals a first-order transition at low temperatures, between two phases distinguished by distinct and well-developed short-range spin correlations, one characterized by spin alignment of a local 120° structure with a $\sqrt{3} \times \sqrt{3}$ period, and the other by a partially spin-flopped structure. We point out the relevance of our results to the unconventional steps observed in volborthite.
- 2010-07-15
著者
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Imada Masatoshi
Department Of Applied Physics University Of Tokyo
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Misawa Takahiro
Department Of Applied Physics University Of Tokyo
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Misawa Takahiro
Department of Applied Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan
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Kaneko Ryui
Department of Applied Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan
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