Electron energy-loss spectroscopy study of the metal-insulator transition in V2O3

Hiroyuki Abe, Masami Terauchi, Michiyoshi Tanaka, Shik Shin

研究成果: Article査読

13 被引用数 (Scopus)

抄録

Electron energy-loss spectra of V2O3 of the paramagnetic metallic (PM) and antiferromagnetic insulating (AFI) phases have been measured by a high-resolution transmission electron energy-loss spectroscopy (EELS) technique. An excitation at about 1eV was previously observed in both the PM and AFI phases by an optical measurement and assigned to the excitation of a free-carrier plasmon. A sharp peak has, however, been observed at 1.1 eV in our EELS spectra of the PM phase but not in those of the AFI phase. We assigned the peak to an interband plasmon due to d-d transitions by inspecting the dielectric function derived from the EELS spectra. The peak of the O 1s EELS spectra due to the O 1s → V 3d(t2g) transition increased in energy by 0.4 eV but decreased in intensity at the transition from the PM phase to the AFI phase. The increase of the energy is due to a splitting of the V 3d(t2g) band, which is partly filled at the PM phase, into the fully occupied and unoccupied bands and a shift of the unoccupied band to an energy higher than the Fermi level in the PM phase. The decrease of intensity is considered to be due to the decrease of the transition probability of the O 1s → V 3d(t2g) transition, which is attributed to the decrease of the hybridization of the V 3d with O 2p orbitals at the transition from the PM phase to the AFI phase.

本文言語English
ページ(範囲)584-588
ページ数5
ジャーナルJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
37
2
DOI
出版ステータスPublished - 1998 2

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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