论文标题
半金属Heusler Compound Co $ _ {2} $ ti $ x $（$ x $ = si，ge）中的异常大厅效应
Anomalous Hall effect in half-metallic Heusler compound Co$_{2}$Ti$X$ ($X$=Si, Ge)
论文作者
论文摘要
尽管最近在几种倒置对称性的材料中观察到了Weyl Fermions，但很少有这些系统逆转对称性的示例。各种Co $ _ {2} $ - 基于半米磁磁铁旋转器化合物最近被预测在其带结构中托管Weyl型激发。这些磁性旋转器化合物的时间逆转对称性有望显示出较大的动量空间浆果曲率，从而引入了几种异国情调的磁通特性。在本报告中，我们对CO $ _2 $ _2 $ ti $ x $（$ x $ = SI和GE）的异常大厅效应（AHE）的实验结果进行系统分析。这项研究是为了了解浆果曲率对AHE的作用。观察到异常的霍尔电阻率在两种化合物的纵向电阻率上四倍地缩放。详细的分析表明，在异常的霍尔电导率中，内在的karplus-luttinger浆果相机制在外部偏斜散射和侧跳机构上占主导地位。
Though Weyl fermions have recently been observed in several materials with broken inversion symmetry, there are very few examples of such systems with broken time reversal symmetry. Various Co$_{2}$-based half-metallic ferromagnetic Heusler compounds are lately predicted to host Weyl type excitations in their band structure. These magnetic Heusler compounds with broken time reversal symmetry are expected to show a large momentum space Berry curvature, which introduces several exotic magneto-transport properties. In this report, we present systematic analysis of experimental results on anomalous Hall effect (AHE) in Co$_2$Ti$X$ ($X$=Si and Ge). This study is an attempt to understand the role of Berry curvature on AHE in Co$_2$Ti$X$ family of materials. The anomalous Hall resistivity is observed to scale quadratically with the longitudinal resistivity for both the compounds. The detailed analysis indicates that in anomalous Hall conductivity, the intrinsic Karplus-Luttinger Berry phase mechanism dominates over the extrinsic skew scattering and side-jump mechanism.
