Evolution of anomalous Hall effect in ferromagnetic Weyl semimetal NbxZr1-xCo2Sn

doi:10.1088/1674-1056/ad4a3b

中国物理B ›› 2024, Vol. 33 ›› Issue (8): 87501-087501.doi: 10.1088/1674-1056/ad4a3b

Evolution of anomalous Hall effect in ferromagnetic Weyl semimetal Nb_xZr_1-xCo₂Sn

Bo-Wen Chen(陈博文)^1,2 and Bing Shen(沈冰)^1,2,†

1 Center for Neutron Science and Technology, Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, School of Physics, Sun Yat-Sen University, Guangzhou 510275, China;
2 State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-Sen University, Guangzhou 510275, China

收稿日期:2024-03-10 修回日期:2024-04-22 出版日期:2024-08-15 发布日期:2024-07-30
通讯作者: Bing Shen E-mail:Shenbing@mail.sysu.edu.cn
基金资助:
Project supported by the National Key Research and Development Program of China (Grant Nos. 2023YFF0718400 and 2023YFA1406500), the National Natural Science Foundation of China (Grant Nos. U2130101 and 92165204), the Natural Science Foundation of Guangdong Province, China (Grant No. 2022A1515010035), the Open Project of Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices (Grant No. 2022B1212010008), and the Open Project of Key Laboratory of Optoelectronic Materials and Technologies (Grant No. OEMT-2023-ZTS-01).

Evolution of anomalous Hall effect in ferromagnetic Weyl semimetal Nb_xZr_1-xCo₂Sn

Bo-Wen Chen(陈博文)^1,2 and Bing Shen(沈冰)^1,2,†

1 Center for Neutron Science and Technology, Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, School of Physics, Sun Yat-Sen University, Guangzhou 510275, China;
2 State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-Sen University, Guangzhou 510275, China

Received:2024-03-10 Revised:2024-04-22 Online:2024-08-15 Published:2024-07-30
Contact: Bing Shen E-mail:Shenbing@mail.sysu.edu.cn
Supported by:
Project supported by the National Key Research and Development Program of China (Grant Nos. 2023YFF0718400 and 2023YFA1406500), the National Natural Science Foundation of China (Grant Nos. U2130101 and 92165204), the Natural Science Foundation of Guangdong Province, China (Grant No. 2022A1515010035), the Open Project of Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices (Grant No. 2022B1212010008), and the Open Project of Key Laboratory of Optoelectronic Materials and Technologies (Grant No. OEMT-2023-ZTS-01).

摘要/Abstract

摘要： Magnetic topological semimetal can host various topological non-trivial states leading to exotic novel transport properties. Here we report the systematic magneto-transport studies on the Heusler alloy Nb$_{x}$Zr$_{1-x}$Co$_2$Sn considered as a ferromagnetic (FM) Weyl semimetal. The cusp anomaly of temperature-dependent resistivity and large isotropic negative magneto-resistivity (MR) emerge around the FM transition consistent with the theoretical half-metallic predictions. The prominent anomalous Hall effect (AHE) has the same behavior with the applied field along various crystal directions. The Nb doping introduces more disorder resulting in the enhancement of the upturn for the temperature-dependent resistivity in low temperatures. With Nb doping, the AHE exhibits systemic evolution with the Fermi level lifted. At the doping level of $x=0.25$, the AHE mainly originates from the intrinsic contribution related to non-trivial topological Weyl states.

关键词: anomalous Hall effect, magnetic Weyl semimetal, ferromagnetism

Abstract: Magnetic topological semimetal can host various topological non-trivial states leading to exotic novel transport properties. Here we report the systematic magneto-transport studies on the Heusler alloy Nb$_{x}$Zr$_{1-x}$Co$_2$Sn considered as a ferromagnetic (FM) Weyl semimetal. The cusp anomaly of temperature-dependent resistivity and large isotropic negative magneto-resistivity (MR) emerge around the FM transition consistent with the theoretical half-metallic predictions. The prominent anomalous Hall effect (AHE) has the same behavior with the applied field along various crystal directions. The Nb doping introduces more disorder resulting in the enhancement of the upturn for the temperature-dependent resistivity in low temperatures. With Nb doping, the AHE exhibits systemic evolution with the Fermi level lifted. At the doping level of $x=0.25$, the AHE mainly originates from the intrinsic contribution related to non-trivial topological Weyl states.

Key words: anomalous Hall effect, magnetic Weyl semimetal, ferromagnetism

中图分类号: (Metals and alloys)

75.20.En

Bo-Wen Chen(陈博文) and Bing Shen(沈冰). Evolution of anomalous Hall effect in ferromagnetic Weyl semimetal Nb_xZr_1-xCo₂Sn[J]. 中国物理B, 2024, 33(8): 87501-087501.

Bo-Wen Chen(陈博文) and Bing Shen(沈冰). Evolution of anomalous Hall effect in ferromagnetic Weyl semimetal Nb_xZr_1-xCo₂Sn[J]. Chin. Phys. B, 2024, 33(8): 87501-087501.

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Evolution of anomalous Hall effect in ferromagnetic Weyl semimetal Nb_xZr_1-xCo₂Sn

Evolution of anomalous Hall effect in ferromagnetic Weyl semimetal Nb_xZr_1-xCo₂Sn

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