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Pressure-tuning domain-wall chirality in noncentrosymmetric magnetic Weyl semimetal CeAlGe

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Abstract

Topological magnetic Weyl semimetals have been proposed to host controllable chiral domain walls which bear a great prospect in device applications. To exploit them in applications, it is important to have a proper way to tune and manipulate these domain walls. One possible means is through magnetoelastic coupling. The involvement of rare earth in the lately proposed RAlX (R = rare earth, X = Si and Ge) family magnetic Weyl semimetals may provide such a platform. Here we present the transport and thermodynamic properties of CeAlGe under hydrostatic pressure. We find that pressure enhances the antiferromagnetic exchange in CeAlGe but essentially retains its magnetic structure. A large topological Hall effect with a pronounced loop shape is observed within the magnetically ordered state, and it splits into two regions under pressure. Such an unusual electromagnetic response is inferred to be a consequence of chiral magnetic domain walls. The unprecedented concomitance of its evolution under pressure and the reentrance of antiferromagnetic order strongly suggest the capability of switching on/off this electromagnetic response in noncentrosymmetric magnetic Weyl semimetals via magnetoelastic coupling.

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Authors and Affiliations

  1. Wuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and Technology, Wuhan, 430074, China

    Xiaobo He, Hai Zeng, Zengwei Zhu & Yongkang Luo

  2. School of Physics and Hangzhou Key Laboratory of Quantum Matter, Hangzhou Normal University, Hangzhou, 311121, China

    Yuke Li

  3. Science and Technology on Surface Physics and Chemistry Laboratory, Mianyang, 621908, China

    Shiyong Tan

  4. Institute for Advanced Materials, Hubei Normal University, Huangshi, 435002, China

    Yongjun Zhang

  5. Center for Correlated Matter and School of Physics, Zhejiang University, Hangzhou, 310058, China

    Chao Cao

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The supporting information is available online at http://phys.scichina.com and https://link.springer.com. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.

This work was supported by the Open Research Fund of Songshan Lake Materials Laboratory (Grant No. 2022SLABFN27), National Natural Science Foundation of China (Grant Nos. 12274364, and U1932155), Fundamental Research Funds for the Central Universities of China (Grant No. 2019kfyXMBZ071), National Key R&D Program of China (Grant No. 2022YFA1602602), Guangdong Basic and Applied Basic Research Foundation (Grant No. 2022B1515120020), and Pioneer and Leading Goose R&D Program of Zhejiang (Grant No. 2022SDXHDX0005). The authors thank Joe D. Thompson for insightful discussions.

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He, X., Li, Y., Zeng, H. et al. Pressure-tuning domain-wall chirality in noncentrosymmetric magnetic Weyl semimetal CeAlGe. Sci. China Phys. Mech. Astron. 66, 237011 (2023). https://doi.org/10.1007/s11433-022-2051-4

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