Atsushi Yamasaki, Shin Imada, Akira Sekiyama, Hidenori Fujiwara, Masao Yano, Junichi Yamaguchi, Toshio Miyamachi, Hitoshi Sugawara, Daisuke Kikuchi, Hideyuki Sato, Takayuki Muro, Atsushi Higashiya, Makina Yabashi, Kenji Tamasaku, Tetsuya Ishikawa, Hisatomo Harima, Shigemasa Suga
June 11, 2013
The electronic structures of rare-earth-filled skutterudites have been investigated by high-resolution photoemission spectroscopy. In order to reveal their bulk nature, the bulk-sensitive photoemission spectroscopy with soft X-ray (hv∼800 – 1100 eV) and hard X-ray (hv∼8000 eV) is a very powerful tool since the rare-earths' valence and electronic structures on the surface are often different from those in the bulk. Our experimental results clearly show the coexistence of the strongly mixed-valence state and the heavy-fermion state in SmOs 4 Sb 12 and the quasi-particle peak near the Fermi level in PrFe 4 P 12 induced by the hybridization between the rare-earth 4f and conduction electrons.