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

TL;DR

This study investigates the anisotropic magnetic and electronic transport properties of Co3Sn2S2, revealing giant magnetocrystalline anisotropy, strong Berry curvature anisotropy, and isotropic in-plane transport, advancing understanding of magnetic Weyl semimetals.

Contribution

It provides detailed measurements of magnetocrystalline anisotropy and transport anisotropies in Co3Sn2S2, highlighting the difficulty in magnetization alignment and the isotropic in-plane transport behavior.

Findings

Giant magnetocrystalline anisotropy with Ku up to 8.3×10^5 J/m^3

Strong anisotropies in Berry curvature and ferromagnetism

Isotropic transport within the kagome plane

Abstract

Co3Sn2S2, a quasi-two-dimensional system with kagome lattice, has been found as a magnetic Weyl semimetal recently. In this work, the anisotropies of magnetization and transport properties of Co3Sn2S2 were investigated. The high field measurements reveal 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 Ku up to 8.3 * 10^5 J m-3, which indicates that it is extremely difficult to align the small moment of 0.29 {\mu}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 always parallel with each other. For in-plane situation, the longitudinal and transverse measurements for both I parallel a and I perpendicular 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.