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The electronic structure of the antiferromagnet uranium nitride (UN) has beenstudied by angle resolved photoelectron spectroscopy using soft X-rays(hn=420-520 eV). Strongly dispersive bands with large contributions from the U5f states were observed in ARPES spectra, and form Fermi surfaces. The bandstructure as well as the Fermi surfaces in the paramagnetic phase are wellexplained by the band-structure calculation treating all the U 5f electrons asbeing itinerant, suggesting that itinerant description of the U 5f states isappropriate for this compound. On the other hand, changes in the spectralfunction due to the antiferromagnetic transition were very small. The shapes ofthe Fermi surfaces in a paramagnetic phase are highly three-dimensional, andthe nesting of Fermi surfaces is unlikely as the origin of the magneticordering.

Itinerant Nature of U 5f States in Uranium Mononitride UN Revealed by Angle Resolved Photoelectron Spectroscopy