Magnetic structure and spin fluctuations in the colossal magnetoresistance ferrimagnet Mn3Si2Te6
Magnetic structure and spin fluctuations in the colossal magnetoresistance ferrimagnet Mn3Si2Te6
复制标题
巨磁阻亚铁磁体Mn3Si2Te6的磁结构和自旋涨落
DOI：
10.1103/physrevb.106.l180402
复制
发表时间：
2022
影响因子：
3.7
通讯作者：
Cao, G.
中科院分区：
文献类型：
--
作者：
Ye, Feng;Matsuda, Masaaki;Morgan, Zachary;Sherline, Todd;Ni, Yifei;Zhao, Hengdi;Cao, G.
亚铁磁绝缘体的居里温度为78 K，当磁场沿硬磁轴沿着施加时，其表现出巨大的磁电阻（CMR），这与现有的先例[Y. Ni，H. Zhao，Y. Zhang，B.胡岛Kimchi和G. Cao，Phys. Rev. B 103，L161105（2021）10.1103/PhysRevB.103.L161105]。这一发现激发了一个彻底的单晶中子衍射研究，以深入了解磁结构及其与新型CMR的隐藏相关性。在这里，我们报告了一个非共线的磁性结构，在该结构中，磁矩主要位于基面内，但在环境条件下向轴倾斜。大量的磁漫散射衰减缓慢，并持续高于。自旋相关长度的演变与电阻率一致，强调了自旋涨落对转变附近的磁阻效应的作用。沿着轴向施加磁场可使CMR迅速发生，但磁矩向轴向缓慢倾斜。这种无与伦比的变化表明磁极化的作用并不重要。
The ferrimagnetic insulator, which features a Curie temperatureat 78 K and a delicate yet consequential magnetic frustration, exhibits colossal magnetoresistance (CMR) when the magnetic field is applied along the magnetic hard axis, surprisingly inconsistent with existing precedents [Y. Ni, H. Zhao, Y. Zhang, B. Hu, I. Kimchi, and G. Cao, Phys. Rev. B 103, L161105 (2021)10.1103/PhysRevB.103.L161105]. This discovery motivates a thorough single-crystal neutron diffraction study in order to gain insights into the magnetic structure and its hidden correlation with the new type of CMR. Here we report a noncollinear magnetic structure below thewhere the moments lie predominantly within the basal plane but tilt toward theaxis byat ambient conditions. A substantial magnetic diffuse scattering decays slowly and persists well above the. The evolution of the spin correlation lengths agrees well with the electrical resistivity, underscoring the role of spin fluctuation contributing to the magnetoresistivity near the transition. Application of magnetic field along theaxis renders a swift occurrence of CMR but only a slow tilting of the magnetic moments toward theaxis. The unparalleled changes indicate a nonconsequential role of magnetic polarization.