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arXiv 1004.2401cond-mat.str-el
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空间畸变Heisenberg Kagome反铁磁体的磁化阶跃

Magnetization Step in Spatially Distorted Heisenberg Kagome Antiferromagnets

Ryui Kaneko, Takahiro Misawa, Masatoshi Imada

摘要:

基于最近对具有kagomé晶格结构的典型自旋- $1/2$反铁磁体--氟硼硫石的实验研究,我们采用蒙特卡罗(MC)方法研究了空间畸变kagomé晶格上经典海森堡模型的磁化过程.我们发现在低温和低磁场下,畸变诱导的磁化阶跃。该阶跃的大小由零温度下的$Δm_z=\left|1-α\right|/3α$给出,其中$α$表示交换常数的空间各向异性。的磁化步骤信号的一阶过渡在低温下,在两个阶段之间的区别由不同的和发达的短程自旋相关性,一个特征在于自旋对齐的本地$120^{\circ}$结构与$\sqrt{3}\times\sqrt{3}$周期,和其他部分自旋翻转的结构。我们指出,我们的研究结果的相关性的非常规步骤中观察到的volborthite。

英文摘要:

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 $Δm_z=\left|1-α\right|/3α$ at zero temperature, where $α$ 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 $120^{\circ}$ 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.

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