Electronic structure of ThPdAl; Impact of the U states on the electronic structure of UPdAl

Fujimori, Shinichi   ; Takeda, Yukiharu   ; Yamagami, Hiroshi; Pospil, J.*; Yamamoto, Etsuji  ; Haga, Yoshinori   

The electronic structure of , which is isostructural to the heavy fermion superconductor , was investigated by photoelectron spectroscopy. The band structure and Fermi surfaces of were obtained by angle-resolved photoelectron spectroscopy (ARPES), and the results were well-explained by the band-structure calculation based on the local density approximation. The comparison between the ARPES spectra and the band-structure calculation suggests that the Fermi surface of mainly consists of the and states with a minor contribution from the states. The comparison of the band structures between and argues that the states form Fermi surfaces in through hybridization with the state in the layer, suggesting that the Fermi surface of has a strong three-dimensional nature.