title: p-type conductivity generated by ferromagnetic ordering via percolative anionic H chain formation in ZnCoO.
abstract: We report on the simultaneous realization of p-type conductivity and strong ferromagnetism in heavily Co-doped ZnO thin films in the presence of a high concentration of hydrogen impurities. Through ab initio calculations, we find that the microscopic origin of hole carrier generations and ferromagnetic ordering is due to the partially occupied band of the percolative structures wherein the carrier-induced magnetic interactions can stabilize the strong spin-parallel state.
authors.affiliation: School of Mechanical and Nuclear Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, Korea.
authors.forename: Hosik
authors.initials: H
authors.lastname: Lee
authors.forename: Jong Moon
authors.initials: JM
authors.lastname: Shin
authors.forename: Yong Chan
authors.initials: YC
authors.lastname: Cho
authors.forename: Seunghun
authors.initials: S
authors.lastname: Lee
authors.forename: Chul Hong
authors.initials: CH
authors.lastname: Park
authors.forename: Noejung
authors.initials: N
authors.lastname: Park
authors.forename: Se-Young
authors.initials: SY
authors.lastname: Jeong
authors.forename: Sung Youb
authors.initials: SY
authors.lastname: Kim