Electronic structure and Fermi surface of UC studied by high-resolution angle-resolved photoemission spectroscopy

We have performed high-resolution angle-resolved photoemission spectroscopy on UC to study the band structure and Fermi surface. The valence band stru cture away from the Fermi level (EF) consisting mainly of the C 2p states s hows a qualitatively good agreement with the band calculation, suggesting a negligible correlation effect in the C 2p states. In contrast. we found a remarkable narrowing of bands near E-F around W point in the Brillouin zone . where a substantial contribution of U 5f states is predicted from the cal culation. This suggests the importance of taking into account the correlati on effect of U 5f electrons for understanding the electronic structure and physical properties of UC. (C) 2001 Elsevier Science B.V. All rights reserv ed.