We have investigated the electronic states of the uranium monochalcogenide US, which is a typical ferromagnetic uranium compound, using soft x-ray photoemission spectroscopy (SX-PES). In early ultraviolet photoemission spectroscopy studies, two peak structures of the U 5f states were observed and have been interpreted that one has an itinerant character around the Fermi level (EF) and the other located below EF has a character of localized U 5f electrons. In this study, the intrinsic bulk valence-band spectrum of US was first deduced by estimating the contribution of surface states to the valence-band spectrum using core-level photoemission spectra. We conclude that the electronic structure of US can be basically described by the itinerant nature of the U 5f electrons from comparison with theoretical valence-band spectra obtained by band-structure calculation in the local-density approximation.
@article{arxiv.0909.2917,
title = {Bulk 5f electronic states in uranium monochalcogenide US},
author = {Y. Takeda and T. Okane and T. Ohkochi and Y. Saitoh and H. Yamagami and A. Fujimori and A. Ochiai},
journal= {arXiv preprint arXiv:0909.2917},
year = {2009}
}
Comments
5pages, 3figures. accepted to PRB as a rapid communication