title: Self-energy on the low- to high-energy electronic structure of correlated metal SrVO3.
abstract: The correlated electronic structure of SrVO(3) has been investigated by angle-resolved photoemission spectroscopy using in situ prepared thin films. Pronounced features of band renormalization have been observed: a sharp kink ∼60 meV below the Fermi level (E(F)) and a broad so-called "high-energy kink" ∼0.3 eV below E(F) as in the high-T(c) cuprates, although SrVO(3) does not show magnetic fluctuations. We have deduced the self-energy in a wide energy range by applying the Kramers-Kronig relation to the observed spectra. The obtained self-energy clearly shows a large energy scale of ∼0.7 eV, which is attributed to electron-electron interaction and gives rise to the ∼0.3 eV kink in the band dispersion as well as the incoherent peak ∼1.5 eV below E(F). The present analysis enables us to obtain a consistent picture for both the incoherent spectra and the band renormalization.
authors.affiliation: Department of Physics, The University of Tokyo, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Aizaki
authors.forename: T
authors.initials: T
authors.lastname: Yoshida
authors.forename: K
authors.initials: K
authors.lastname: Yoshimatsu
authors.forename: M
authors.initials: M
authors.lastname: Takizawa
authors.forename: M
authors.initials: M
authors.lastname: Minohara
authors.forename: S
authors.initials: S
authors.lastname: Ideta
authors.forename: A
authors.initials: A
authors.lastname: Fujimori
authors.forename: K
authors.initials: K
authors.lastname: Gupta
authors.forename: P
authors.initials: P
authors.lastname: Mahadevan
authors.forename: K
authors.initials: K
authors.lastname: Horiba
authors.forename: H
authors.initials: H
authors.lastname: Kumigashira
authors.forename: M
authors.initials: M
authors.lastname: Oshima