Anisotropic magnetoelastic response in the magnetic Weyl semimetal Co&lt;sub&gt;3&lt;/sub&gt;Sn&lt;sub&gt;2&lt;/sub&gt;S&lt;sub&gt;2&lt;/sub&gt;

Liu, Chang; Yi, Chang Jiang; Wang, Xing Yu; Shen, Jian Lei; Xie, Tao; Yang, Lin; Fennel, Tom; Stuhr, Uwe; Li, Shi Liang; Weng, Hong Ming; Shi, You Guo; Liu, En Ke; Luo, Hui Qian

doi:10.1007/s11433-020-1655-2

Anisotropic magnetoelastic response in the magnetic Weyl semimetal Co₃Sn₂S₂

Liu C, Yi CJ, Wang XY, Shen JL, Xie T, Yang L, Fennel T, Stuhr U, Li SL, Weng HM, Shi YG, Liu EK & Luo HQ

Citation

Liu, C., Yi, C. J., Wang, X. Y., Shen, J. L., Xie, T., Yang, L., … Luo, H. Q. (2021). Anisotropic magnetoelastic response in the magnetic Weyl semimetal Co₃Sn₂S₂. Science China: Physics, Mechanics and Astronomy, 64(5), 257511 (9 pp.). https://doi.org/10.1007/s11433-020-1655-2

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:36713

Co₃Sn₂S₂ is a recently identified magnetic Weyl semimetal in Shandite compounds. Upon cooling, Co₃Sn₂S₂ 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 T_C with a maximum of anomalous Hall angle near T_A. Here, we report an elastic neutron scattering on the crystalline lattice of Co₃Sn₂S₂ 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 Co₃Sn₂S₂ lattice and its related topological states.