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X-ray photoemission spectroscopy measurements were performed on thin-filmsamples of rutile Ti_{1-x}Co_{x}O_{2-delta} to reveal the electronic structure.The Co 2p core level spectra indicate that the Co ions take the high-spin Co 2+configuration, consistent with substitution on the Ti site. The high spin stateand the shift due to the exchange splitting of the conduction band suggeststrong hybridization between carriers in the Ti 3d t2g band and the t2g statesof the high-spin Co 2+. These observations support the argument that roomtemperature ferromagnetism in Ti_{1-x}Co_{x}O_{2-delta} is intrinsic.Comment: 4 pages, 5 figures. Accepted for publication in Physical Review  Letter

physical review letters

Signature of Carrier-Induced Ferromagnetism in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>Ti</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Co</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:math>: Exchange Interaction between High-Spin<mml:math xmlns:mml…

Signature of Carrier-Induced Ferromagnetism inTi1−xCoxO2−δ: Exchange Interaction between High-Spin