Electronic structure of Cu-doped ZnO thin films by x-ray absorption, magnetic circular dichroism, and resonant inelastic x-ray scattering

Title
Electronic structure of Cu-doped ZnO thin films by x-ray absorption, magnetic circular dichroism, and resonant inelastic x-ray scattering
Authors
P. ThakurV. BisogniJ. C. CezarN. B. BrookesG. Ghiringhelli가우탐채근화M. SubramanianR. JayavelK. Asokan
Keywords
near-edge x-ray absorption fine structure; resonant inelastic x-ray scattering; Cu-doped ZnO thin films; electronic structure
Issue Date
2010-05
Publisher
Journal of applied physics
Citation
VOL 107, NO 10, 103915-1-103915-7
Abstract
The electronic structure of Cu-doped ZnO thin films, synthesized with a nominal composition of Zn1−xCuxO (x=0.03, 0.05, 0.07, and 0.10) by using spray pyrolysis method, has been investigated using near-edge x-ray absorption fine structure (NEXAFS) experiments at the O K- and the Cu L3,2-edges and resonant inelastic x-ray scattering (RIXS) measurements at Cu L3,2 edge. The Zn1−xCuxO thin films showed single phase wurtzite-hexagonal like crystal structure and ferromagnetic behavior at room temperature (RT). The intensity of the pre-edge spectral feature at the O K-edge increases with the Cu concentration, which clearly reveals that there is strong hybridization of O 2p–Cu 3d orbitals in the ZnO matrix. Spectral features of the Cu L3,2-edge NEXAFS exhibit multiple absorption peaks and appreciable x-ray magnetic circular dichroism signal that persists even at RT. These results demonstrate that Cu is in mixed valence state of Cu2+,3+ /Cu1+, substituting at the Zn site and Cu2+/3+ ions are magnetically polarized. RIXS experiments at Cu L3 edge show strong d-d excitations due to localized nature of Cu ions in the ZnO matrix.
URI
http://pubs.kist.re.kr/handle/201004/38259
ISSN
0021-8979
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KIST Publication > Article
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