Chinese Acad Sci, Fujian Inst Res Struct Matter, Lab Mat Chem & Phys, Fujian 350002, Peoples R China
; Chinese Acad Sci, Beijing Synchrotron Radiat Facil, Inst High Energy Phys, Beijing 100049, Peoples R China
; Univ Sci & Technol China, Dept Phys, Hefei 230026, Peoples R China
; Natl China NanaSci & Technol, Beijing 100080, Peoples R China
; Jilin Univ, Dept Phys, Changchun 130021, Peoples R China
Zn0.95Co0.05O single crystal was obtained through hydrothermal crystal growth method. Extended x-ray absorption fine structure and x-ray absorption near-edge structure spectra as well as UV absorption measurements reveal that Co2+ ions have substituted Zn2+ ions and incorporated into ZnO lattice. The single crystal shows typical paramagnetic property from 2 to 300 K. A paramagnetic anisotropy property in the crystal is found. The single ion anisotropy origin from tetrahedral coordination Co in the ZnO lattice was introduced to explain the phenomena. This work verified the paramagnetic anisotropy phenomena in ZnO-Co. (c) 2006 American Institute of Physics.