title: Electronic band structure and Fermi surface of CaB6 studied by angle-resolved photoemission spectroscopy.
abstract: We report high-resolution angle-resolved photoemission spectroscopy (ARPES) on CaB6. The band structure determined by ARPES shows a 1 eV energy gap at the X point between the valence and the conduction bands. We found a small electron pocket at the X point, whose carrier number is estimated to be (4-5) x 10(19) cm(-3), in good agreement with the Hall resistivity measurement with the same crystal. The experimental results are discussed in comparison with band structure calculations and theoretical models for the high-temperature ferromagnetism.
authors.affiliation: Department of Physics, Tohoku University, Sendai 980-8578, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Souma
authors.forename: H
authors.initials: H
authors.lastname: Komatsu
authors.forename: T
authors.initials: T
authors.lastname: Takahashi
authors.forename: R
authors.initials: R
authors.lastname: Kaji
authors.forename: T
authors.initials: T
authors.lastname: Sasaki
authors.forename: Y
authors.initials: Y
authors.lastname: Yokoo
authors.forename: J
authors.initials: J
authors.lastname: Akimitsu