title: Pseudogap formation in the intermetallic compounds (Fe1-xVx)3Al
abstract: Optical conductivity data of the intermetallic compounds (Fe1-xVx)3Al ( 0</=x</=0.33) reveal that their density of states around the Fermi energy ( E(F)) is strongly reduced as x is increased. In particular, Fe2VAl ( x = 0.33) has a deep, well-developed pseudogap of 0.1-0.2 eV at E(F) and a small density ( approximately 5x10(20) cm(-3)) of carriers, which is highly unusual for intermetallic compounds. It is shown that the pseudogap results from the band structure of Fe2VAl, rather than from temperature-dependent correlation effects. Based on the present results, we propose a simple model that consistently explains both the semiconductorlike transport and the metallic photoemission results previously observed for Fe2VAl.
authors.affiliation: Department of Physics and Graduate School of Science and Technology, Kobe University, Kobe 657-8501, Japan.
authors.initials: H
authors.lastname: Okamura
authors.initials: J
authors.lastname: Kawahara
authors.initials: T
authors.lastname: Nanba
authors.initials: S
authors.lastname: Kimura
authors.initials: K
authors.lastname: Soda
authors.initials: U
authors.lastname: Mizutani
authors.initials: Y
authors.lastname: Nishino
authors.initials: M
authors.lastname: Kato
authors.initials: I
authors.lastname: Shimoyama
authors.initials: H
authors.lastname: Miura
authors.initials: K
authors.lastname: Fukui
authors.initials: K
authors.lastname: Nakagawa
authors.initials: H
authors.lastname: Nakagawa
authors.initials: T
authors.lastname: Kinoshita