Observation of 5 electrons in the itinerant limit; Three-dimensional electronic structure of UB

Okochi, Takuo; Fujimori, Shinichi   ; Yamagami, Hiroshi*; Okane, Tetsuo  ; Saito, Yuji  ; Fujimori, Atsushi*; Haga, Yoshinori   ; Yamamoto, Etsuji  ; Onuki, Yoshichika*

We have derived the three dimensional band structure and Fermi surfaces of itinerant uranium compound UB by soft X-ray angle resolved photoelectron spectroscopy. We have observed clear energy dispersions and Fermi surfaces with large contribution from U 5 states. The obtained results have been compared with the result of band-structure calculation within the local density functional approximation as well as the results of dHvA study. The qualitative agreement has been obtained in the size and topology of the Fermi surfaces with the band structure calculation and the dHvA measurement. Meanwhile, their band structure near the Fermi level is slightly different from the calculation. This might be due to a dynamic renormalization beyond the LDA band calculations even in the very itinerant 5 compound.