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

作　　者：Xiaobo He Yuke Li Hai Zeng Zengwei Zhu Shiyong Tan Yongjun Zhang Chao Cao Yongkang Luo 

机构地区：[1]Wuhan National High Magnetic Field Center and School of Physics,Huazhong University of Science and Technology,Wuhan 430074,China [2]School of Physics and Hangzhou Key Laboratory of Quantum Matter,Hangzhou Normal University,Hangzhou 311121,China [3]Science and Technology on Surface Physics and Chemistry Laboratory,Mianyang 621908,China [4]Institute for Advanced Materials,Hubei Normal University,Huangshi 435002,China [5]Center for Correlated Matter and School of Physics,Zhejiang University,Hangzhou 310058,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2023年第3期121-129,共9页中国科学：物理学、力学、天文学（英文版）

基　　金：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.2019kfy XMBZ071);National Key R&D Program of China(Grant No.2022YFA1602602);Guangdong Basic and Applied Basic Research Foundation(Grant No.2022B1515120020);Pioneer and Leading Goose R&D Program of Zhejiang(Grant No.2022SDXHDX0005)。

摘　　要：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 

分 类 号：O46[理学—电子物理学]