Temperature dependent XAS of FePS3 compound

In 2D antiferromagnetic MPS3 compounds – M is a 3d transition metal – the correlation between spin and orbital excitations often leads to strong coupling between the electronic transitions and the lattice magnetic order. Unlike other members of the family, no evidences have been reported up to now for FePS3, despite the higher magnetic moment of iron. Our preliminary Resonant Inelastic X-ray Scattering (RIXS) measurements at the Fe L3 edge show indications of a possible correlation between dd electronic transitions and magnetic excitations, also supported by simulations. However, accurate knowledge of the absorption behavior below and above the Neel temperature as well as of the homogeneity of the sample are preliminary to analyze RIXS data. To this purpose we aim to study the temperature dependence of XAS in FePS3 between 20 and 200K.

在二维反铁磁MPS₃化合物（其中M为3d过渡金属）中，自旋与轨道激发之间的关联通常会导致电子跃迁与晶格磁序间存在强耦合。与该家族的其他成员不同，尽管铁具有更高的磁矩，但截至目前尚无关于FePS₃的相关研究报道。我们在Fe L₃边开展的初步共振非弹性X射线散射（Resonant Inelastic X-ray Scattering, RIXS）测量结果显示，dd电子跃迁与磁激发之间或存在关联，这一结论也得到了模拟计算的支持。然而，要准确解析RIXS数据，我们首先需要精准掌握奈耳温度（Neel temperature）上下的吸收特性以及样品的均匀性。为此，我们拟研究FePS₃在20 K至200 K区间内X射线吸收谱（X-ray Absorption Spectroscopy, XAS）的温度依赖关系。