Electronic structure and photoemission studies on Kondo semimetal U $\mathsf{_2}$ Ru $\mathsf{_2}$ Sn

Abstract

Electronic structure is studied of the compound U2Ru2Sn showing Kondo type anomalies. The X-ray photoemission spectrum (XPS) on a single crystal was measured and the crystal structure refinement was done. The electronic band structure was calculated by the tight-binding linear muffin-tin orbital method in the atomic sphere approximation, with non-local corrections to the exchange-correlation potential and spin-orbit effects included. The XPS valence band is well reproduced by the calculated one. Calculations suggest metallic character of U2Ru2Sn and give the electronic specific heat coefficient by a factor 1.4 larger than the experimental value reported in literature.