High-resolution photoemission study of the electronic structure near the Fermi level of uranium intermetallic compounds(Abstracts of Doctoral Dissertations,Annual Report(from April 2001 to March 2002))

High-resolution photoemission spectroscopy on various intermetallic uranium compounds has been performed to study the electronic structure near Ep as well as the essential character of U 5felectrons. As a result, we found two peak structures originating in the dual character of U 5felectrons. From the comparison between several compounds where strong different character of U 5felectrons has been expected, we conclude that the itineracy of U 5f electrons appears as narrow U 5fbands hybridized with conduction s, p, d electrons, whereas the broad U 5fmultiplet structures below E_F originates in the localized character of the U 5felectron. Furthermore, temperature-dependent shift of U 5fPDOS below T_C has been observed on UXc. The observed change suggests that the itinerant U 5felectron plays dominant role in magnetic phase transition of these compounds.[figure