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Ultrahigh-Resolution Photoemission Spectroscopy on UGe2

We have performed temperature-dependent high-resolution photoemission spectroscopy on UGe 2 . The spectrum shows a sharp peak with a dominant U 5 f character near the Fermi level ( E F ), in good agreement with the band structure calculation based on the itinerant U 5 f model. The peak gradually moves toward E F with increasing temperature across the Curie temperature ( T C ), indicating the temperature-induced change of the density of states near E F . The present results are well interpreted in terms of the Stoner-like temperature-dependent density of states responsible for the occurrence of the ferromagnetism below T C .