Static and dynamic critical properties of the quasi-two-dimensional antiferromagnet MnPS3
Static and dynamic critical properties of the quasi-two-dimensional antiferromagnet MnPS3
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DOI：
10.1103/physrevb.74.094422
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发表时间：
2006-09-01
影响因子：
3.7
通讯作者：
Godfrey, K. W.
中科院分区：
文献类型：
--
作者：
Wildes, A. R.;Ronnow, H. M.;Godfrey, K. W.
对准二维反铁磁体 MnPS3 的静态和动态临界特性进行了全面研究。 Mn 离子相对较大的自旋 S=5/2 确保了主要的经典行为，并且该化合物被认为是蜂窝晶格上海森堡型系统的一个很好的例子。该样品已使用各种中子散射技术和仪器进行了测量。将结果与三维 (3D) 海森堡模型、二维经典 O(3) 旋转器模型、二维 XY 模型以及相关的二维各向异性海森堡模型进行比较。最后一个模型几乎完全在测量的温度范围内最好地描述了临界属性，除了刚好低于尼尔温度的临界行为似乎是 3D 的。存在一些差异，特别是在自旋刚度和结构因子的能量宽度的重新调整方面。为类 XY 行为提供了一种可能的解释，涉及系统中的磁各向异性及其对哈密顿量的影响。
A comprehensive study of the static and dynamic critical properties of the quasi-two-dimensional antiferromagnet MnPS3 is presented. The relatively large spin S=5/2 of the Mn ions ensure predominantly classical behavior, and the compound is believed to be a good example of a Heisenberg-type system on a honeycomb lattice. The sample has been measured using a variety of neutron-scattering techniques and instrumentation. The results are compared to the three-dimensional (3D) Heisenberg model, the two-dimensional classical O(3) rotator model, the two-dimensional XY model, and the related two-dimensional anisotropic Heisenberg model. The critical properties appear to be best described by the last model almost entirely over the measured temperature range, except just below the Neel temperature where the critical behavior seems to be 3D. There are some discrepancies, particularly in the rescaling of the spin stiffness and the energy widths of the structure factor. A possible explanation for the XY-like behavior is offered, involving the magnetic anisotropy in the system and its influence on the Hamiltonian.