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The electronic structure of the natural topological semimetalCo$_3$Sn$_2$S$_2$ crystals was studied using near-edge x-ray absorptionspectroscopy (NEXAFS) and resonant photoelectron spectroscopy (ResPES).Although, the significant increase of the Co\,$3d$ valence band emission isobserved at the Co\,$2p$ absorption edge in the ResPES experiments, thespectral weight at these photon energies is dominated by the normal Augercontribution. This observation indicates the delocalised character ofphotoexcited Co\,$3d$ electrons and is supported by the first-principlecalculations. Our results on the investigations of the element- andorbital-specific electronic states near the Fermi level of Co$_3$Sn$_2$S$_2$are of importance for the comprehensive description of the electronic structureof this materials, which is significant for future applications of thismaterial in different areas of science and technology, including catalysis andwater splitting applications.

Topological Quasi-2D Semimetal Co$_3$Sn$_2$S$_2$: Insights To Electronic Structure From NEXAFS and Resonant Photoelectron Spectroscopy