V-V dimerization effects on bulk-sensitive hard x-ray photoemission spectra for Magnéli phase vanadium oxides

M. Obara, A. Sekiyama, S. Imada, J. Yamaguchi, T. Miyamachi, T. Balashov, W. Wulfhekel, M. Yabashi, K. Tamasaku, A. Higashiya, T. Ishikawa, Kohei Fujiwara, H. Takagi, S. Suga

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Highly bulk-sensitive hard x-ray photoemission has been performed for the Magnéli phase V5 O9 and V6 O11, which are composed of V2 O3 and VO2 from chemical point of view. The valence-band spectra near the Fermi level are rather similar between V5 O9 and V6 O11 in both metallic and insulating phases. Although the core-level spectra in the metallic phase are similar between V5 O9 and V6 O11, the core-level spectra in the insulating phase are noticeably different. Our results are understood by considering the contribution of the V-V dimerization effects, which are strong in V6 O11 and negligible in V5 O9. Comparison of the core-level spectra of V5 O9 and V6 O11 with those of VO2 has revealed that the mechanism of the metal-insulator transitions for the former two compounds is different from that for VO2.

Original languageEnglish
Article number113107
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number11
DOIs
Publication statusPublished - 2010 Mar 22
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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