We have performed high-resolution angle-resolved photoemission spectroscopy on UN and USb to study the electronic structure near the Fermi level (EF) and the nature of U 5f electrons. We found that the pnictogen (N and Sb) p bands are fully occupied in contrast with Ce monopnictides and shows a good qualitative agreement with the band calculation by treating the U 5f states as bands. On the other hand, we have not observed dispersive U 5f bands near EF predicted by the band calculation, instead we found two non-dispersive bands near EF, which are assigned as the 5f2-final-state multiplet indicative of localized U 5f states. The intensity of multiplet structure is stronger in USb than in UN. These results indicate the dual character of U 5f electrons and its difference between USb and UN.
- Actinide compounds
- Band structure
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics