Signature of Carrier-Induced Ferromagnetism in Ti₁₋ₓCoₓO2-delta: Exchange Interaction Between High-Spin Co 2+ and the Ti 3d Conduction Band

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X-ray photoemission spectroscopy measurements were performed on thin-film samples of rutile Ti₁₋ₓCoₓO2-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 state and the shift due to the exchange splitting of the conduction band suggest strong hybridization between carriers in the Ti 3d t2g band and the t2g states of the high-spin Co 2+. These observations support the argument that room temperature ferromagnetism in Ti₁₋ₓCoₓO2-delta is intrinsic.