Kondo effect and impurity band conduction in Co:TiO2 magnetic semiconductor

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Ramaneti, R. and Lodder, J.C. and Jansen, R. (2007) Kondo effect and impurity band conduction in Co:TiO2 magnetic semiconductor. Physical Review B: Condensed matter and materials physics, 76 (19). pp. 195207-1. ISSN 1098-0121

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Abstract:The nature of charge carriers and their interaction with local magnetic moments in an oxide magnetic semiconductor is established. For cobalt-doped anatase TiO2 films, we demonstrate conduction in a metallic donor-impurity band. Moreover, we observe a clear signature of the Kondo effect in electrical transport data with remarkably high Kondo temperatures of up to 120 K. This indicates a strong coupling between local Co moments and delocalized electrons in the impurity band.
Item Type:Article
Copyright:© 2007 American Physical Society
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Link to this item:http://purl.utwente.nl/publications/58272
Official URL:http://dx.doi.org/10.1103/PhysRevB.76.195207
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Metis ID: 247019