title: X-ray spectroscopic study of the charge state and local ordering of room-temperature ferromagnetic Mn-doped ZnO.
abstract: The charge state and local ordering of Mn doped into a pulsed laser deposited single-phase thin film of ZnO are investigated by using x-ray absorption spectroscopy at the O K-edge, Mn K-edge and L-edge, and x-ray emission spectroscopy at the O K-edge and Mn L-edge. This film is ferromagnetic at room temperature. EXAFS measurement shows that Mn(2+) replaces the Zn site in tetrahedral symmetry, and there is no evidence for either metallic Mn or MnO in the film. Upon Mn doping, the top of O 2p valence band extends into the bandgap, indicating additional charge carriers being created.
authors.affiliation: Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
authors.forename: J-H
authors.initials: JH
authors.lastname: Guo
authors.forename: Amita
authors.initials: A
authors.lastname: Gupta
authors.forename: Parmanand
authors.initials: P
authors.lastname: Sharma
authors.forename: K V
authors.initials: KV
authors.lastname: Rao
authors.forename: M A
authors.initials: MA
authors.lastname: Marcus
authors.forename: C L
authors.initials: CL
authors.lastname: Dong
authors.forename: J M O
authors.initials: JM
authors.lastname: Guillen
authors.forename: S M
authors.initials: SM
authors.lastname: Butorin
authors.forename: M
authors.initials: M
authors.lastname: Mattesini
authors.forename: P A
authors.initials: PA
authors.lastname: Glans
authors.forename: K E
authors.initials: KE
authors.lastname: Smith
authors.forename: C L
authors.initials: CL
authors.lastname: Chang
authors.forename: R
authors.initials: R
authors.lastname: Ahuja