Electronic structure of Co2+ ions in anatase Co:TiO2 in relation to heterogeneity and structural defects

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Lee, Y.J. and Jong, M.P. de and Wiel, W.G. van der (2011) Electronic structure of Co2+ ions in anatase Co:TiO2 in relation to heterogeneity and structural defects. Physical Review B: Condensed matter and materials physics, 83 (13). pp. 1344041-1344045. ISSN 1098-0121

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Abstract:We have studied the electronic structure of Co ions in semiconducting anatase Co:TiO2(1.4 at.% Co) with x-ray-absorption spectroscopy. The density of structural defects is varied by (i) the oxygen vacancy concentration depending on the oxygen background pressure during growth, and (ii) the film thickness. TheCoL2,3-edge spectra, which are characteristic of Co2+ (3d7) ions, show particularly pronounced ligand-to-metal charge-transfer (CT) satellites for the thickest oxygen-poor films, which also exhibit the highest structural defect density. With charge-transfer multiplet calculations, the CT satellites are modeled by configuration interaction, originating from hybridization between Co 3d- and ligand states. This hybridization adds to the complex interplay between Co heterogeneity, defects, and electronic and magnetic properties in Co:TiO2.
Item Type:Article
Copyright:© 2011 American Physical Society
Faculty:
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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Link to this item:http://purl.utwente.nl/publications/79117
Official URL:http://dx.doi.org/10.1103/PhysRevB.83.134404
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