title: High-resolution photoelectron spectroscopy of Heusler-type Fe(2)VAl alloy.
abstract: The electronic structure of Heusler-type Fe(2)VAl has been studied by high-resolution photoelectron spectroscopy with the excitation photon energy hnu ranging from 21.2 eV (the He I laboratory light source) to 904 eV (the soft X-ray synchrotron light source) for clean surfaces prepared by scraping or fracturing polycrystalline and single crystalline specimens. Photoelectron spectra recorded for the fractured surfaces show a 10 eV-wide valence band with fine structures and a clear decrease in the intensity towards the Fermi level E(F), while a high intensity at E(F) and no fine structures are observed for the scraped surface. Comparison with the theoretical density of states (DOS) indicates that the vacuum ultraviolet photoelectron spectra emphasize the transition-metal 3d bands but the soft X-ray photoelectron spectra agree remarkably well with the DOS including the fine structures and the pseudogap at E(F). The present results suggest that the electronic structure of Fe(2)VAl is highly sensitive to possible strain and defects induced by scraping. Bulk electronic structures of Fe(2)VAl are discussed in relation to the reported fascinating transport properties.
authors.affiliation: Department of Crystalline Materials Science, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan. j45880a@nucc.cc.nagoya-u.ac.jp
authors.forename: Kazuo
authors.initials: K
authors.lastname: Soda
authors.forename: Tatsunori
authors.initials: T
authors.lastname: Mizutani
authors.forename: Osamu
authors.initials: O
authors.lastname: Yoshimoto
authors.forename: Shinya
authors.initials: S
authors.lastname: Yagi
authors.forename: Uichiro
authors.initials: U
authors.lastname: Mizutani
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Sumi
authors.forename: Yoichi
authors.initials: Y
authors.lastname: Nishino
authors.forename: Yuh
authors.initials: Y
authors.lastname: Yamada
authors.forename: Takayoshi
authors.initials: T
authors.lastname: Yokoya
authors.forename: Shik
authors.initials: S
authors.lastname: Shin
authors.forename: Akira
authors.initials: A
authors.lastname: Sekiyama
authors.forename: Shigemasa
authors.initials: S
authors.lastname: Suga