Magnetoelastic coupling in the incommensurate antiferromagnetic phase of FeOCl
Magnetoelastic coupling in the incommensurate antiferromagnetic phase of FeOCl
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DOI：
10.1103/physrevb.86.134428
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发表时间：
2012-10-26
影响因子：
3.7
通讯作者：
Kremer, Reinhard K.
中科院分区：
文献类型：
--
作者：
Zhang, Jian;Woelfel, Alexander;Kremer, Reinhard K.
用变温X射线衍射实验、磁化率、热容和介电测量研究了FeOCl的反铁磁性相变。发现磁性相变伴随着单斜晶格畸变，影响平行于组成准二维磁性系统的层的晶轴之间的角度伽马角。与温度有关的伽马星等表明相变是二级的。卫星反射发生在具有两倍磁调制波矢量的X射线衍射中。这些位置与温度有关，为磁序的无公度特性提供了证据。观测到的Neel温度为T-N=81.0(2)K。
The antiferromagnetic phase transition of FeOCl has been studied by temperature-dependent x-ray-diffraction experiments, magnetic susceptibility, heat capacity, and dielectric measurements. The magnetic phase transition is found to be accompanied by a monoclinic lattice distortion, affecting the angle gamma between crystallographic axes parallel to the layers comprising the quasi-two-dimensional magnetic system. The temperature-dependent magnitude of gamma shows the phase transition to be of second order. Satellite reflections occur in x-ray diffraction with twice the magnetic modulation wave vector. These positions are temperature dependent, providing evidence for an incommensurate character of the magnetic order. The observed Neel temperature is T-N = 81.0 (2) K.