On the anisotropies of magnetization and electronic transport of magnetic Weyl semimetal Co₃Sn₂S₂

Co₃Sn₂S₂, a quasi-two-dimensional system with kagome lattice, has been found as the first magnetic Weyl semimetal recently[1-3]. In this work, the anisotropies of magnetization and transport properties of Co₃Sn₂S₂ were investigated. High field measurement results indicate this semimetal shows a giant magnetocrystalline anisotropy with an out-of-plane saturation field of 0.9 kOe and an in-plane saturation field of 230 kOe at 2 K, showing a magnetocrystalline anisotropy coefficient K_u up to 8.3 × 10⁵ J m^-3, which indicates that it is extremely difficult to align the small moment of 0.29 μ_B/Co on the kagome lattice from c axis to ab plane. The out-of-plane angular dependences of Hall conductivity further reveal strong anisotropies in Berry curvature and ferromagnetism, and the vector directions of both are parallel with each other. For in-plane situation, the longitudinal and transverse measurements for both I // a and I ⊥ a cases show that the transport on the kagome lattice is isotropic. These results provide essential understanding on the magnetization and transport behaviors for the magnetic Weyl semimetal Co₃Sn₂S₂.
[1]E.K. Liu, et al. Nat. Phys. 14, 1125 (2018).
[2]D.F. Liu, et al. Science 365, 1282 (2019).
[3]N. Morali, et al. Science 365, 1286 (2019).