Signature of carrier-induced ferromagnetism in Ti1-xCoxO2-δ: Exchange interaction between high-spin Co2+ and the Ti 3d conduction band

J. W. Quilty, A. Shibata, J. Y. Son, K. Takubo, Takashi Mizokawa, H. Toyosaki, T. Fukumura, M. Kawasaki

Research output: Contribution to journalArticle

93 Citations (Scopus)

Abstract

X-ray photoemission spectroscopy measurements were performed on thin-film samples of rutile Ti1-xCoxO2-δ to reveal the electronic structure. The Co 2p core-level spectra indicate that the Co ions take the high-spin Co2+ 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-δ is intrinsic.

Original languageEnglish
Article number027202
JournalPhysical Review Letters
Volume96
Issue number2
DOIs
Publication statusPublished - 2006 Jan 20
Externally publishedYes

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ferromagnetism
conduction bands
signatures
interactions
rutile
photoelectric emission
substitutes
electronic structure
shift
room temperature
thin films
configurations
spectroscopy
ions
x rays

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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Signature of carrier-induced ferromagnetism in Ti1-xCoxO2-δ : Exchange interaction between high-spin Co2+ and the Ti 3d conduction band. / Quilty, J. W.; Shibata, A.; Son, J. Y.; Takubo, K.; Mizokawa, Takashi; Toyosaki, H.; Fukumura, T.; Kawasaki, M.

In: Physical Review Letters, Vol. 96, No. 2, 027202, 20.01.2006.

Research output: Contribution to journalArticle

Quilty, J. W. ; Shibata, A. ; Son, J. Y. ; Takubo, K. ; Mizokawa, Takashi ; Toyosaki, H. ; Fukumura, T. ; Kawasaki, M. / Signature of carrier-induced ferromagnetism in Ti1-xCoxO2-δ : Exchange interaction between high-spin Co2+ and the Ti 3d conduction band. In: Physical Review Letters. 2006 ; Vol. 96, No. 2.
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