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Photoemission study of Zn 1− x Co x O as a possible DMS

2004; Wiley; Volume: 241; Issue: 7 Linguagem: Inglês

10.1002/pssb.200304598

1521-3951

S. C. Wi, J.‐S. Kang, Jae‐Hoon Kim, S. S. Lee, Sunglae Cho, B. J. Kim, Sungpil Yoon, Byoung Jin Suh, Sang Wook Han, K. H. Kim, K. J. Kim, B. S. Kim, H. J. Song, H. J. Song, Hyun Joon Shin, Jeong Hyun Shim, B. I. Min,

Electronic and Structural Properties of Oxides

Abstract We report a photoemission spectroscopy (PES) and X‐ray absorption spectroscopy (XAS) study for bulk Zn 1− x Co x O samples ( x = 0 and 0.1). Both the Co 2p XAS and the Co 2p core‐level PES spectra show that the doped Co ions in Zn 1− x Co x O are in the divalent Co 2+ (d 7 ) states under the tetrahedral symmetry. A Co 2p → 3d resonant photoemission spectroscopy measurement shows that the Co 3d states lie near the top of the O 2p valence band. This work suggests that the doped Co ions in Zn 1−x Co x O substitute properly for the Zn sites with Co 2+ valence states. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)