Figure 47.

(a) Magnetic structure of Co₃Sn₂S₂, showing a FM ground state with spins on Co atoms aligned along the c-axis. (b) Kagome lattice structure of the Co₃Sn layer. (c) Topographic image of the CoSn surface. (d) A zoom-in image of the CoSn surface (left) that shows similar morphology with the FeSn surface (right) in Fe₃Sn₂. The inset illustrates the possible atomic assignment of the kagome lattice. Panels (a–d) are adapted with permission under a Creative Commons CC BY 4.0 license from ref (514). Copyright 2020 Springer Nature. (e) The temperature dependence of the intrinsic anomalous hall conductivity in Co₃Sn₂S₂. (f) Left: linear band crossings form a nodal ring in the mirror plane. Right: Spin–orbit coupling breaks the nodal ring band structure into opened gaps and Weyl nodes. The Weyl nodes are located just 60 meV above the Fermi level, whereas the gapped nodal lines are distributed around the Fermi level. Panels (e) and (f) are adapted with permission from ref (515). Copyright 2018 Springer Nature.