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33% Giant Anomalous Hall Current Driven by Both Intrinsic and Extrinsic Contributions in Magnetic Weyl Semimetal Co3Sn2S2
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-06-25 , DOI: 10.1002/adfm.202000830 Jianlei Shen 1, 2 , Qingqi Zeng 1, 2 , Shen Zhang 1, 2 , Hongyi Sun 3 , Qiushi Yao 3 , Xuekui Xi 1 , Wenhong Wang 1, 4 , Guangheng Wu 1 , Baogen Shen 1 , Qihang Liu 5 , Enke Liu 1, 4
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-06-25 , DOI: 10.1002/adfm.202000830 Jianlei Shen 1, 2 , Qingqi Zeng 1, 2 , Shen Zhang 1, 2 , Hongyi Sun 3 , Qiushi Yao 3 , Xuekui Xi 1 , Wenhong Wang 1, 4 , Guangheng Wu 1 , Baogen Shen 1 , Qihang Liu 5 , Enke Liu 1, 4
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The anomalous Hall effect (AHE) can be induced by intrinsic mechanisms due to the band Berry phase and extrinsic one arising from the impurity scattering. The recently discovered magnetic Weyl semimetal Co3Sn2S2 exhibits a large intrinsic anomalous Hall conductivity (AHC) and a giant anomalous Hall angle (AHA). The predicted energy dependence of the AHC in this material exhibits a plateau at 1000 Ω−1 cm−1 and an energy width of 100 meV just below E F, thereby implying that the large intrinsic AHC will not significantly change against small‐scale energy disturbances such as slight p‐ doping. Here, the extrinsic contribution is successfully triggered from alien‐atom scattering in addition to the intrinsic one of the pristine material by introducing a small amount of Fe dopant to substitute Co in Co3Sn2S2. The experimental results show that the AHC and AHA can be prominently enhanced up to 1850 Ω−1 cm−1 and 33%, respectively, owing to the synergistic contributions from the intrinsic and extrinsic mechanisms as distinguished by the TYJ model. In particular, the tuned AHA exhibits a record value among known magnetic materials in low fields. This study opens up a pathway to engineer giant AHE in magnetic Weyl semimetals, thereby potentially advancing the topological spintronics/Weyltronics.
中文翻译：
磁性Weyl半金属Co3Sn2S2的内在和外在贡献驱动33％的巨型异常霍尔电流
霍尔效应（AHE）可以由内在机理引起，这归因于带状Berry相和由杂质散射引起的非本征带。最近发现的磁性Weyl半金属Co 3 Sn 2 S 2具有较大的固有异常霍尔电导率（AHC）和巨大的异常霍尔角（AHA）。该材料中AHC的预测能量依赖性在1000Ω -1 cm -1处表现出平稳，能量宽度刚好在E F以下为100 meV ，这意味着较大的固有AHC在小规模能量扰动下不会发生明显变化。例如轻微的p-掺杂。在这里，通过引入少量的Fe掺杂剂替代Co 3 Sn 2 S 2中的Co，除了原始材料的本征之一以外，还通过异质原子散射成功地触发了外在贡献。实验结果表明，由于TYJ模型的内在和外在机理的协同作用，AHC和AHA分别可以显着提高至1850Ω -1 cm -1和33％。特别地，经调谐的AHA在低场中的已知磁性材料中表现出创纪录的价值。这项研究为在磁性Weyl半金属中设计巨型AHE开辟了一条道路，从而有可能推进拓扑自旋电子学/ Weyltronics。
更新日期：2020-08-08
中文翻译：
磁性Weyl半金属Co3Sn2S2的内在和外在贡献驱动33％的巨型异常霍尔电流
霍尔效应（AHE）可以由内在机理引起，这归因于带状Berry相和由杂质散射引起的非本征带。最近发现的磁性Weyl半金属Co 3 Sn 2 S 2具有较大的固有异常霍尔电导率（AHC）和巨大的异常霍尔角（AHA）。该材料中AHC的预测能量依赖性在1000Ω -1 cm -1处表现出平稳，能量宽度刚好在E F以下为100 meV ，这意味着较大的固有AHC在小规模能量扰动下不会发生明显变化。例如轻微的p-掺杂。在这里，通过引入少量的Fe掺杂剂替代Co 3 Sn 2 S 2中的Co，除了原始材料的本征之一以外，还通过异质原子散射成功地触发了外在贡献。实验结果表明，由于TYJ模型的内在和外在机理的协同作用，AHC和AHA分别可以显着提高至1850Ω -1 cm -1和33％。特别地，经调谐的AHA在低场中的已知磁性材料中表现出创纪录的价值。这项研究为在磁性Weyl半金属中设计巨型AHE开辟了一条道路，从而有可能推进拓扑自旋电子学/ Weyltronics。
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