Abstract
We have carried out soft X-ray angle-resolved photoemission spectroscopy experiments on U(Ru 0.97 Rh 0.03 ) 2 Si 2 , which shows antiferromagnetic (AFM) ordering at low temperatures. We have revealed that U 5 f electrons contribute to the formation of the energy band as well as Fermi surface. This suggests that the AFM ordering is caused by a spin density wave of itinerant U 5 f electrons. The observed band dispersion and Fermi surface are nearly identical to those of URu 2 Si 2 . Therefore, the AFM ordering vector Q =(1,0,0) can be a possible ordering vector of the hidden order phase in URu 2 Si 2 .
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