Speaker
Description
Co$_3$Sn$_2$S$_2$ is a Weyl ferromagnet (T$_c$ ~ 177 K) with kagome layers stacked along its c-axis. A recent resonant inelastic X-ray scattering (RIXS) study with linear polarized X-rays reported correlation driven near-flat band Stoner excitations. However, our RIXS measurements employing a magnetic circular dichroism (MCD) analysis suggests that the reported “near-flat band” is dispersive and its intensity reduces upon approaching Tc. We suggest these excitations correspond to the electron-hole pair excitations between spin-polarized occupied and unoccupied bands that are s directly related to the magnetic order. Furthermore, the MCD RIXS spectrum shows opposite sign compared to spin waves in the ferromagnetic topological metal Fe3Sn2 due to the orbital moment involvement.
