论文标题
X射线磁圆二色性和\ textit {ab intio}计算，Cr $ _2 $ _2 $ gec中的磁各向异性
Magnetic anisotropy in Cr$_2$GeC investigated by X-ray magnetic circular dichroism and \textit{ab initio} calculations
论文作者
论文摘要
元素选择性，极化和温度依赖性，软X射线吸收光谱和X射线磁性圆形二色症，研究了固有的纳米胶质三元最大相关CR $ _ {2} $ GEC中磁性的磁性。测量结果表明，沿纳米磁性$ AB $ - $ - 基础飞机在六边形结构的$ C $轴上进行了抗磁性CR-CR耦合。弱铬磁矩是纳米胶粉平面中比垂直轴强的数量级。从理论上讲，一个小但著名的非自旋 - 胶片组件解释了沿$ C $轴的不完美自旋补偿的存在。如这项工作所示，这种自旋失真会在单位细胞内产生一个类似于费里磁铁的整体残留旋转力矩。由于竞争磁相互作用不同，需要考虑电子相关性和温度效应才能实现CR $ _ {2} $ GEC磁性特性的正确理论描述。
The magnetism in the inherently nanolaminated ternary MAX-phase Cr$_{2}$GeC is investigated by element-selective, polarization and temperature-dependent, soft X-ray absorption spectroscopy and X-ray magnetic circular dichroism. The measurements indicate an antiferro-magnetic Cr-Cr coupling along the $c$-axis of the hexagonal structure modulated by a ferromagnetic ordering in the nanolaminated $ab$-basal planes. The weak chromium magnetic moments are an order of magnitude stronger in the nanolaminated planes than along the vertical axis. Theoretically, a small but notable, non-spin-collinear component explains the existence of a non-perfect spin compensation along the $c$-axis. As shown in this work, this spin distortion generates an overall residual spin moment inside the unit cell resembling that of a ferri-magnet. Due to the different competing magnetic interactions, electron correlations and temperature effects both need to be considered to achieve a correct theoretical description of the Cr$_{2}$GeC magnetic properties.
