title: Electronic structure of K-doped picene film on HOPG.
abstract: We have performed potassium (K)-doping dependent photoemission (PES) measurements of picene film on highly oriented pyrolytic graphite (HOPG). K-doping dependent valence band PES data exhibits a shift of the valence band to a higher binding energy, indicative of the charge transfer from the K atoms to the picene film. K-doping dependent PES spectra near the Fermi level (EF) show the appearance and disappearance of a Fermi edge, indicating the metallic properties of the film at certain K concentrations. High-resolution PES spectrum at the lowest measured temperature does not show an opening of the superconducting gap, requesting further studies to explore the superconducting properties of the K-doped picene film. The results will be discussed by comparison with previous and recent spectroscopic studies.
authors.affiliation: Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Wakita
authors.forename: H
authors.initials: H
authors.lastname: Okazaki
authors.forename: T
authors.initials: T
authors.lastname: Jabuchi
authors.forename: H
authors.initials: H
authors.lastname: Hamada
authors.forename: Y
authors.initials: Y
authors.lastname: Muraoka
authors.forename: T
authors.initials: T
authors.lastname: Yokoya