Electronic structure and temperature-induced paramagnetism in LaCoO3

T. Saitoh, Takashi Mizokawa, A. Fujimori, M. Abbate, Y. Takeda, M. Takano

Research output: Contribution to journalArticle

285 Citations (Scopus)

Abstract

We have studied the electronic structure of LaCoO3 by photoemission spectroscopy and x-ray absorption spectroscopy (XAS). The Co 2p core-level and valence-band photoemission spectra display satellite structures indicating a strong electron-correlation effect. The Co 2p core-level photoemission, the valence-band photo-emission, and the O 1s XAS spectra have been analyzed using a configuration-interaction cluster model for the initial-state configurations of the low-spin (LS: 1A1), intermediate-spin (IS: 3T1) and high-spin (HS: 5F2) states and their mixtures. The ground state of LaCoO3 in the LS state is found to have heavily mixed d6 and d7L character, reflecting the strong covalency. The magnetic susceptibility has been analyzed for various level orderings of the LS, IS, and HS states. From the analyses of the photoemission spectra and the magnetic susceptibility data, the temperature-induced paramagnetism in LaCoO3 above ∼90 K is most likely due to a gradual LS-to-IS transition.

Original languageEnglish
Pages (from-to)4257-4266
Number of pages10
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume55
Issue number7
Publication statusPublished - 1997 Feb 15
Externally publishedYes

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Paramagnetism
paramagnetism
Photoemission
Electronic structure
photoelectric emission
Core levels
electronic structure
Valence bands
Magnetic susceptibility
Absorption spectroscopy
x ray absorption
x ray spectroscopy
X rays
Electron correlations
absorption spectroscopy
Photoelectron spectroscopy
valence
magnetic permeability
Temperature
Ground state

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Electronic structure and temperature-induced paramagnetism in LaCoO3. / Saitoh, T.; Mizokawa, Takashi; Fujimori, A.; Abbate, M.; Takeda, Y.; Takano, M.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 55, No. 7, 15.02.1997, p. 4257-4266.

Research output: Contribution to journalArticle

Saitoh, T, Mizokawa, T, Fujimori, A, Abbate, M, Takeda, Y & Takano, M 1997, 'Electronic structure and temperature-induced paramagnetism in LaCoO3', Physical Review B - Condensed Matter and Materials Physics, vol. 55, no. 7, pp. 4257-4266.
Saitoh, T. ; Mizokawa, Takashi ; Fujimori, A. ; Abbate, M. ; Takeda, Y. ; Takano, M. / Electronic structure and temperature-induced paramagnetism in LaCoO3. In: Physical Review B - Condensed Matter and Materials Physics. 1997 ; Vol. 55, No. 7. pp. 4257-4266.
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AU - Takano, M.

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