Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-07-08
Phys. Rev. Lett. 96, 027202 (2006)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 5 figures. Accepted for publication in Physical Review Letters
Scientific paper
10.1103/PhysRevLett.96.027202
X-ray photoemission spectroscopy measurements were performed on thin-film samples 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 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 Ti_{1-x}Co_{x}O_{2-delta} is intrinsic.
Fukumura Tomoteru
Kawasaki Masahiro
Mizokawa Takashi
Quilty J. W.
Shibata Akihiro
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