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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Exchange-induced spin reorientation in La1-xGdxMn2Si2
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Exchange-induced spin reorientation in La1-xGdxMn2Si2

机译：La1-XGDXMN2SI2中的交换诱导的旋转重新定位

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摘要

Magnetic properties of the La1-xGdxMn2Si2 (0 = x = 1) compounds with layered ThCr2Si2-type structure have been studied using quasi-single-crystalline and polycrystalline samples. Concentration dependences of critical temperatures of magnetic phase transitions, effective magnetic moments and paramagnetic Curie temperatures have been determined for different compositions. Using the obtained results, we plotted the concentration magnetic phase diagram. The type of the interlayer Mn-Mn magnetic ordering is found to depend on the intralayer Mn-Mn distance. With increasing the Gd concentration, the ordering of the Mn sublattice changes from ferromagnetic (F) to antiferromagnetic (AF) at x approximate to 0.2-0.27. We found that the concentration F-AF magnetic phase transition is accompanied by a change of magnetic anisotropy from the easy-axis to the easy-plane type at low temperatures when the Gd moments are magnetically ordered. The transition can hardly be expected since the Mn sublattice has a strong easy-axis type anisotropy in LaMn2Si2, while the Gd has zero orbital momentum and typically weakly contribute to the magnetic anisotropy. The spin reorientation in the La1-xGdxMn2Si2 has been attributed to a competition between the Gd-Mn and Mn-Mn exchange interactions. (C) 2018 Elsevier B.V. All rights reserved.
机译：使用准单晶和多晶样品研究了La1-XGDXMN2SI2（0＆ = x＆ = 1）化合物的La1-XGDXMN2SI2（0＆ = 1）化合物。针对不同的组合物确定了磁相转变的临界温度，有效磁矩和顺磁静脉温度的临界温度的浓度依赖性。使用得到的结果，我们绘制了浓度磁相图。发现层间Mn-Mn磁性排序的类型取决于腔内Mn-Mn距离。随着GD浓度的增加，Mn子分开的顺序从铁磁（F）在x近似到0.2-0.27的x近似的反铁磁性（AF）。我们发现，当GD时刻被磁性有序时，浓度F-AF磁相转变伴随着从易轴到易轴的磁各向异性的变化。由于Mn子分子在LAMN2SI2中具有强易轴型各向异性，而GD具有零轨道动量并且通常弱轨道，因此过渡可以预期。由于零轨道动量，并且通常略微有助于磁各向异性。 La1-XGDXMN2SI2中的旋转重新定位归因于GD-Mn和Mn-Mn交换相互作用之间的竞争。 （c）2018年elestvier b.v.保留所有权利。

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