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Anisotropic magnetoelastic response in the magnetic Weyl semimetal Co_(3)Sn_(2)S_(2)

Science China(Physics,Mechanics & Astronomy) 2021年第5期64卷 82-90页

作者： Chang Liu ChangJiang Yi XingYu Wang JianLei Shen Tao Xie Lin Yang tom fenne Uwe Stuhr ShiLiang Li HongMing Weng YouGuo Shi EnKe Liu HuiQian Luo Beijing National Laboratory for Condensed Matter Physics Institute of PhysiesChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBejing 100190China Laboratory for Neutron Scattering and Imaging Paul Scherrer InstituteVlligen CH-5232Switzerland Songshan Lake Materials Laboratory Dongguan 523808China SCAS Centre for Excelence in Topological Quantum Computation Bejing 100190China Physical Science Laboratory Huairou National Comprehensive Science CenterBeijing 101400China

Co_(3)Sn_(2)S_(2) is a recently identified magnetic Weyl semimetal in Shandite compounds. Upon cooling, Co_(3)Sn_(2)S_(2) undergoes a ferromagnetic transition with c-axis polarized moments(0.3 μ_(B)/Co) around T_(C)= 175 K, followed by another magnetic anomaly around T_(A)≈ 140 K. A large intrinsic anomalous Hall effect is observed in the magnetic state below TC with a maximum of anomalous Hall angle near T_(A). Here, we report an elastic neutron scattering on the crystalline lattice of Co_(3)Sn_(2)S_(2) in a magnetic field up to 10 T. A strongly anisotropic magnetoelastic response is observed, while only a slight enhancement of the Bragg peaks is observed when B//c. The in-plane magnetic field(B//ab) dramatically suppresses the Bragg peak intensity probably by tilting the moments and lattice toward the external field direction. The in-plane magnetoelastic response commences from T_(C), and as it is further strengthened below T_(A), it becomes nonmonotonic against the field between T_(A) and T_(C) because of the competition from another in-plane magnetic order. These results suggest that a magnetic field can be employed to tune the Co_(3)Sn_(2)S_(2) lattice and its related topological states.

关键词： Weyl semimetal magneto-elastic coupling topological materials elastic neutron scattering ferromagnetism

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