The electronic structure of the f-based superconductor CeIr3​
was studied by photoelectron spectroscopy. The energy distribution of the
Ce 4f states were revealed by the Ce 3d−4f resonant
photoelectron spectroscopy. The Ce 4f states were mostly distributed
in the vicinity of the Fermi energy, suggesting the itinerant character of the
Ce 4f states. The contribution of the Ce 4f states to the
density of states (DOS) at the Fermi energy was estimated to be nearly half of
that of the Ir 5d states, implying that the Ce 4f states
have a considerable contribution to the DOS at the Fermi energy. The
Ce 3d core-level and Ce 3d X-ray absorption spectra were
analyzed based on a single-impurity Anderson model. The number of the
Ce 4f states in the ground state was estimated to be 0.8−0.9,
which is much larger than the values obtained in the previous studies (i.e.,
0−0.4).Comment: 9 pages, 4 figures, accepted to Electronic Structur