发表机构
Indian Institute of Technology Kanpur; Research Institute for Synchrotron Radiation Science (HiSOR), Hiroshima University; Indian Institute of Technology Roorkee（坎普尔印度理工学院; 广岛大学同步辐射科学研究所（HiSOR）; 罗克印度理工学院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过多种实验与第一性原理计算，揭示了凯格米铁磁体MgMn6Sn6的磁各向异性、各向异性磁输运及其与凯格米电子结构的关联。
AI 中文摘要
我们利用磁化强度、角度依赖磁电阻、X射线磁圆二色（XMCD）、角分辨光电子能谱（ARPES）和第一性原理计算，报道了凯格米铁磁体MgMn6Sn6的磁性、磁输运和电子性质。MgMn6Sn6在TC=295 K附近表现出铁磁有序，并具有显著的易平面磁各向异性。在低温和低磁场下，磁电阻（MR）相对于磁场方向表现出强烈的各向异性，从面内磁场下主要为负的磁电阻演变为面外磁场下更接近二次方的行为。角度依赖测量进一步揭示了显著的双重对称磁电阻各向异性，并伴有额外的高阶贡献。XMCD揭示的有限轨道-自旋矩比表明自旋-轨道耦合（SOC）在MgMn6Sn6中起着重要作用。第一性原理计算显示，在K点存在类狄拉克能带交叉，在M点存在范霍夫奇点（VHS），这符合凯格米材料的预期。ARPES测量解析出六重对称的费米面及其随束缚能的系统演化，与第一性原理计算总体一致。测得的能带色散也与计算的多带电子结构大致相符。这些结果建立了MgMn6Sn6的磁各向异性、各向异性磁输运与凯格米衍生电子结构之间的联系。
英文摘要
We report the magnetic, magnetotransport, and electronic properties of the kagome ferromag net MgMn6Sn6 using magnetization, angle dependent magnetoresistance, x-ray magnetic circular dichroism (XMCD), angle resolved photoemission spectroscopy (ARPES), and first-principles cal culations. MgMn6Sn6 exhibits ferromagnetic ordering near TC=295 K with pronounced easy plane magnetic anisotropy. At low temperatures and low magnetic fields, the magnetoresistance (MR) is strongly anisotropic with respect to the magnetic field orientation, evolving from a predominantly negative MR for in-plane fields to a more quadratic behavior for out-of-plane fields. Angle depen dent measurements further reveal a pronounced twofold MR anisotropy with additional higher order contributions. The finite orbital-to-spin moment ratio revealed by XMCD suggests a significant role of spin-orbit coupling (SOC) in MgMn6Sn6. The first-principles calculations show a Dirac-like band crossing at the K point and a van Hove singularity (VHS) at the M point, as expected for kagome materials. ARPES measurements resolve a sixfold symmetric Fermi surface and its systematic evo lution with binding energy, in overall agreement with first-principles calculations. The measured band dispersions are also broadly consistent with the calculated multiband electronic structure. These results establish the connection between magnetic anisotropy, anisotropic magnetotransport, and the kagome derived electronic structure of MgMn6Sn6.
