标题： Fe-rich kagome磁体Fe3Sn中异常霍尔效应的外部抑制 显示英文标题

标题： Extrinsic suppression of anomalous Hall effect in Fe-rich kagome magnet Fe3Sn

摘要： 在铁基凯格梅磁体中，Fe3Sn被预测具有最大的本征异常霍尔电导率（AHC）和最高的居里温度TC = 743 K。然而，实验结果表明，由于强的外部贡献，总AHC远低于预测值。为了抑制外部贡献并从而增强本征贡献，我们在化学计量比Fe3Sn中增加了铁含量。我们发现外部贡献被大大抑制，本征贡献占主导地位，并在整个温度范围内接近理论预测值555 S/cm。基于斜散射公式，我们分析了斜散射被抑制的原因，发现杂质中心提供的自旋轨道耦合强度是关键。本研究中作为杂质中心的铁提供的自旋轨道耦合强度远小于之前研究中作为杂质中心的锡提供的自旋轨道耦合强度。因此，富铁Fe3Sn中的AHC遵循统一理论，而富锡Fe3Sn中的AHC偏离统一理论。我们的研究为调节凯格梅磁体中外部贡献对异常霍尔效应的影响提供了一个有前景的解决方案。 显示英文摘要

摘要： In Fe-based kagome magnets, Fe3Sn has been predicted to have the largest intrinsic anomalous Hall conductivity (AHC) and the highest Curie temperature TC = 743 K. However, the current experimental results show that the total AHC is much lower than the predicted value due to the strong extrinsic contribution. To suppress the extrinsic contribution and thus enhance the intrinsic contribution, we increased the Fe content in the stoichiometric Fe3Sn. We found that the extrinsic contribution is greatly suppressed, and the intrinsic contribution is dominant and is close to the theoretically predicted value of 555 S/cm over the whole temperature range. Based on the formula of the skew scattering, we analyzed the reason why the skew scattering is suppressed and found that the spin-orbit coupling strength provided by the impurity center is the key. The spin-orbit coupling strength provided by Fe as an impurity center in this study is much smaller than that of Sn as an impurity center in previous studies. Therefore, the AHC in Fe-rich Fe3Sn obeys the unified theory, while the AHC in Sn-rich Fe3Sn deviates from the unified theory. Our study provides a promising solution for the regulation of the extrinsic contribution to the anomalous Hall effect in kagome magnets.