Valence changes associated with the metal-insulator transition in Bi1-xLaxNiO3

H. Wadati, M. Takizawa, T. T. Tran, K. Tanaka, Takashi Mizokawa, A. Fujimori, A. Chikamatsu, H. Kumigashira, M. Oshima, S. Ishiwata, M. Azuma, M. Takano

Research output: Contribution to journalArticle

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Abstract

Perovskite-type BiNiO3 is an insulating antiferromagnet in which a charge disproportionation occurs at the Bi site. La substitution for Bi suppresses the charge disproportionation and makes the system metallic. We have measured the photoemission and x-ray-absorption (XAS) spectra of Bi1-xLaxNiO3 to investigate how the electronic structure changes with La doping. From Ni 2p XAS, we observed an increase of the valence of Ni from 2+ toward 3+. Combined with the core-level photoemission study, it was found that the average valence of Bi remains ∼4+ and that the Ni valence behaves as ∼(2+x)+, that is, La substitution results in a hole doping at the Ni sites. In the valence-band photoemission spectra, we observed a Fermi cutoff for x>0, consistent with the metallic behavior of the La-doped compounds. The Ni 2p XAS, Ni 2p core-level photoemission, and valence-band photoemission spectra were analyzed by configuration-interaction cluster-model calculation, and the spectral line shapes were found to be consistent with the gradual Ni2+→Ni3+ valence change.

Original languageEnglish
Article number155103
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume72
Issue number15
DOIs
Publication statusPublished - 2005 Oct 15
Externally publishedYes

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Metal insulator transition
Photoemission
insulators
valence
photoelectric emission
x ray absorption
Core levels
metals
Valence bands
X rays
Substitution reactions
Doping (additives)
substitutes
Perovskite
x ray spectra
Electronic structure
Absorption spectra
configuration interaction
line spectra
line shape

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Valence changes associated with the metal-insulator transition in Bi1-xLaxNiO3. / Wadati, H.; Takizawa, M.; Tran, T. T.; Tanaka, K.; Mizokawa, Takashi; Fujimori, A.; Chikamatsu, A.; Kumigashira, H.; Oshima, M.; Ishiwata, S.; Azuma, M.; Takano, M.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 72, No. 15, 155103, 15.10.2005.

Research output: Contribution to journalArticle

Wadati, H, Takizawa, M, Tran, TT, Tanaka, K, Mizokawa, T, Fujimori, A, Chikamatsu, A, Kumigashira, H, Oshima, M, Ishiwata, S, Azuma, M & Takano, M 2005, 'Valence changes associated with the metal-insulator transition in Bi1-xLaxNiO3', Physical Review B - Condensed Matter and Materials Physics, vol. 72, no. 15, 155103. https://doi.org/10.1103/PhysRevB.72.155103
Wadati, H. ; Takizawa, M. ; Tran, T. T. ; Tanaka, K. ; Mizokawa, Takashi ; Fujimori, A. ; Chikamatsu, A. ; Kumigashira, H. ; Oshima, M. ; Ishiwata, S. ; Azuma, M. ; Takano, M. / Valence changes associated with the metal-insulator transition in Bi1-xLaxNiO3. In: Physical Review B - Condensed Matter and Materials Physics. 2005 ; Vol. 72, No. 15.
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