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

Science China(Physics,Mechanics & Astronomy) 2023年第3期66卷 121-129页

作者： Xiaobo He Yuke Li Hai Zeng Zengwei Zhu Shiyong Tan Yongjun Zhang Chao Cao Yongkang Luo Wuhan National High magnetic Field Center and School of Physics Huazhong University of Science and TechnologyWuhan 430074China School of Physics and Hangzhou Key Laboratory of Quantum Matter Hangzhou Normal UniversityHangzhou 311121China Science and Technology on Surface Physics and Chemistry Laboratory Mianyang 621908China Institute for Advanced Materials Hubei Normal UniversityHuangshi 435002China Center for Correlated Matter and School of Physics Zhejiang UniversityHangzhou 310058China

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 RAl X(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 Ce Al Ge under hydrostatic pressure. We find that pressure enhances the antiferromagnetic exchange in Ce Al Ge 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.

关键词： magnetic weyl semimetals loop-shaped topological Hall effect domain wall weyl point magnetoelastic coupling

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