2025/04/07 by Achintya Low, Low, Achintya, Tushar Kanti Bhowmik +7
Physics and Astronomy · Materials Science · #Topological Materials and Phenomena #Chemical and Physical Properties of Materials #Magnetic properties of thin films
paper · pdf · doi:10.48550/arxiv.2504.05252
We report the anomalous and topological Hall effect of the ferromagnetic Weyl semimetal Mn5Ge3. We observe a significant anisotropic anomalous Hall effect (AHE) due to nonzero Berry curvature in the momentum space, such that the anomalous Hall conductivity (AHC) is 965 S/cm for the xy-plane and 233 S/cm for the zx-plane of the single crystal. The band structure calculations predict several Weyl and nodal points span across the momentum space, gapped out under the spin-orbit coupling effect, leading to significant k-space Berry curvature and large AHC. Experimentally, we also demonstrate a sizeable topological Hall effect that is originated by the non-coplanar chiral spin structure due to the competition between the out-of-plane uniaxial magnetocrystalline anisotropy and the dipole-dipole interaction between two Mn sublattices. This study hints at the importance of dipole-dipole interactions in producing the skyrmion lattice in Mn5Ge3.