论文标题
C和SN缺陷MN $ _3 $ SNC中的磁结构耦合调制
Modulations in magnetostructural coupling in C and Sn deficient Mn$_3$SnC
论文作者
论文摘要
使用X-ray difforcory研究了Stotoichiometric（Mn $ _3 $ SNC）中的结构和磁相互作用（Mn $ _3 $ SNC），缺陷（Mn $ _3 $ snc $ _ {0.8} $）和TIN缺陷（Mn $ _3 $ _3 $ _ {0.85} $ _ {0.85} $ C）使用X-ray difforcory进行了研究，并使用X-RAY PROSIORCORY进行了研究。该研究证实了仅在Antiperovskite化合物中仅在Mn原子附近存在局部结构畸变，无论其化学计量如何。 Mn $ _6 $ c contahedra中的扭曲使得只有Mn原子从其晶体学位置流离失所，从而导致长长和短的MN-MN键。这些长和短的MN-MN键是MN原子上的铁磁和抗铁磁矩的原因。八面体中心的C缺乏增加了Mn $ _6 $ c八面体的应变，并导致Mn-Mn键距离随温度和磁性特性中的较大滞后作用而导致巨大的变化。另一方面，SN缺乏症倾向于通过为八面体扭曲而导致温度无关MN-MN键距离扭曲的空间来放松应变。
The structural and magnetic interactions in stoichiometric (Mn$_3$SnC), carbon deficient (Mn$_3$SnC$_{0.8}$) and tin deficient (Mn$_3$Sn$_{0.85}$C) antiperovskite compounds are studied using x-ray absorption fine structure spectroscopy and neutron diffraction. The study confirms the presence of local structural distortions only around Mn atoms in the antiperovskite compounds irrespective of their stoichiometry. The distortions in the Mn$_6$C octahedra are such that only Mn atoms are displaced from their crystallographic positions resulting in long and short Mn-Mn bonds. These long and short Mn-Mn bonds are responsible for presence of ferromagnetic and antiferromagnetic moments on Mn atoms. The C deficiency at the center of the octahedra increases the strain on the Mn$_6$C octahedra and results in a wide variation of Mn-Mn bond distances as a function of temperature and large hysteresis in magnetic properties. On the other hand, Sn deficiency tends to relax strain by giving more space for the octahedra to distort leading to temperature independent Mn-Mn bond distances.
