Abstract
The electronic structure of CeNiSn, a potential topological Kondo insulator and a Dirac nodal-loop semimetal, is investigated here employing temperature-dependent angle-resolved photoemission spectroscopy (ARPES). Dispersive states crossing the Fermi level (${E}_{\text{F}}$) exhibit general agreement with theoretical predictions of bulk Ni 3$d$ bands and show consistency with a topological hourglass-type crossing of bulk bands below ${E}_{\text{F}}$. Flat Ce 4$f$ states at ${E}_{\text{F}}$ exhibit a Kondo resonance temperature dependence consistent with bulk transport. This work demonstrates the importance of coherent Kondo states in determining the topological properties of CeNiSn.
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