title: In situ photoemission study of the room temperature ferromagnet ZnGeP2:Mn.
abstract: The chemical states of the ZnGeP(2):Mn interface which shows ferromagnetism above room temperature have been studied by photoemission spectroscopy. Mn deposition on the ZnGeP2 substrate heated to 400 degrees C induced Mn substitution for Zn and then the formation of metallic Mn-Ge-P compounds. Depth profile studies have shown that Mn 3d electrons changed their character from itinerant to localized along the depth, and in the deep region, dilute divalent Mn species (<5% Mn) was observed with a coexisting metallic Fermi edge of non-Mn 3d character. The possibility of hole doping through Mn substitution for Ge and/or Zn vacancy is discussed.
authors.affiliation: Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Ishida
authors.forename: D D
authors.initials: DD
authors.lastname: Sarma
authors.forename: K
authors.initials: K
authors.lastname: Okazaki
authors.forename: J
authors.initials: J
authors.lastname: Okabayashi
authors.forename: J I
authors.initials: JI
authors.lastname: Hwang
authors.forename: H
authors.initials: H
authors.lastname: Ott
authors.forename: A
authors.initials: A
authors.lastname: Fujimori
authors.forename: G A
authors.initials: GA
authors.lastname: Medvedkin
authors.forename: T
authors.initials: T
authors.lastname: Ishibashi
authors.forename: K
authors.initials: K
authors.lastname: Sato