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首页> 外文期刊>Physical review >Structural and magnetic properties of the ferroelectric magnet BaMn_(1-x)Zn_xF_4, a site diluted square-lattice two-dimensional Heisenberg antiferromagnet with S = 5/2
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Structural and magnetic properties of the ferroelectric magnet BaMn_(1-x)Zn_xF_4, a site diluted square-lattice two-dimensional Heisenberg antiferromagnet with S = 5/2

机译：铁电磁铁BaMn_（1-x）Zn_xF_4的结构和磁性，这是S = 5/2的局部稀释的方格二维Heisenberg反铁磁体

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摘要

The influence of Zn doping on the structural and magnetic properties of multiferroic BaMnF_4 has been investigated using temperature dependent x-ray diffraction and magnetization measurements. With increasing Zn content the transition temperatures of the structural incommensurate phase transition as well as the AF ordering decrease. For x=0.75 no incommensurate phase is found anymore. The suppression of the structural transition can be explained due to the smaller size of Zn compared with Mn. The suppression of the antifer-romagnetic ordering can be explained by a site dilution of the magnetic structure with nonmagnetic Zn. The percolation threshold is found to be x_p=0.393(4). This is in agreement with predictions for a site-diluted square-lattice weak-anisotropy two-dimensional Heisenberg antiferromagnet with S=5/2.
机译：锌的掺杂对多铁性BaMnF_4的结构和磁性的影响已使用温度相关的X射线衍射和磁化测量进行了研究。随着Zn含量的增加，结构不相称的相变的转变温度以及AF的有序化降低。对于x ＝ 0.75，不再找到不相称的相。可以解释由于锌的尺寸比锰小，因此抑制了结构转变。反铁磁有序化的抑制可以通过用非磁性Zn稀释磁性结构来解释。发现渗滤阈值为x_p = 0.393（4）。这与S = 5/2的站点稀释的方格弱各向异性二维海森堡反铁磁体的预测是一致的。

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