标题： 拓扑铁磁体Mn3Si2Te6中的短程磁序和平面各向异性 显示英文标题

标题： Short-range magnetic order and planar anisotropy in the topological ferrimagnet Mn3Si2Te6

摘要： Mn3Si2Te6是一种铁磁性拓扑节线半导体，表现出非常规的巨大磁阻（CMR）行为，短程自旋涨落可能与出现的特性密切相关。 在本工作中，我们通过多晶Mn3Si2Te6的中子总散射和极化中子粉末衍射（pNPD）测量确定了短程磁序并量化了局部磁各向异性。 通过应用磁对分布函数（mPDF）分析，确定了实空间中的局部和长程自旋结构，测量范围从低温有序相到高温顺磁态。 在长程铁磁转变温度以上，发现三个最近邻的受挫三聚体存在短程序。 在自旋极化顺磁态中进行的pNPD测量用于提取Mn离子的局部位点磁化率张量，以量化磁各向异性。 我们的mPDF和pNPD结果提供了关于Mn3Si2Te6固有短程序的定量信息，显示强面内各向异性，自旋在零场下主要限制在ab平面，并且在从长程到短程有序转变过程中随着温度升高保持稳定。 显示英文摘要

摘要： Mn3Si2Te6 is a ferrimagnetic topological nodal-line semiconductor that exhibits unconventional colossal magnetoresitance (CMR) behavior, with short-range spin fluctuations being potentially intimately linked to the emergent properties. In this work, we determine the short range magnetic order and quantify the local magnetic anisotropy through total neutron scattering and polarized neutron powder diffraction (pNPD) measurements on polycrystalline Mn3Si2Te6. The real space local and long range spin structure was determined through the application of magnetic pair distribution function (mPDF) analysis, with measurements from the low temperature ordered phase to the high temperature paramagnetic state. Short-range order over a frustrated trimer of three nearest neighbors was found to exist well above the long range ferrimagnetic transition. pNPD measurements in the spin polarized paramagnetic state were used to extract the local site susceptibility tensor of the Mn ions to quantify the magnetic anisotropy. Our combined mPDF and pNPD results provide quantitative information on the short-range order intrinsic to Mn3Si2Te6, showing strong in-plane anisotropy with the spins largely confined to the ab-plane in zero field and remain stable with increasing temperature through the long-range to short-range ordered transition.