Large anomalous Hall effect in single crystals of the kagome Weyl ferromagnet Fe 3 Sn

The material class of kagome metals has rapidly grown and has been established as a field to explore the interplay between electronic topology and magnetism. In this work, we report a combined theoretical and experimental study of the anomalous Hall effect of the ferromagnetic kagome metal ${\mathrm{Fe}}_{3}\mathrm{Sn}$. The compound orders magnetically at 725 K and presents an easy-plane anisotropy. Hall measurements in single crystals below room temperature yield an anomalous Hall conductivity ${\ensuremath{\sigma}}_{xy}\ensuremath{\sim}500\phantom{\rule{4pt}{0ex}}{(\mathrm{\ensuremath{\Omega}}\phantom{\rule{0.16em}{0ex}}\text{cm})}^{\ensuremath{-}1}$, which is found to depend weakly on temperature. This value is in good agreement with the band-intrinsic contribution obtained by density-functional calculations. Our calculations also yield the correct magnetic anisotropy energy and predict the existence of Weyl nodes near the Fermi energy.