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, K. Fujiwara, H. Takagi, S. Suga

研究成果: Article査読

14 被引用数 (Scopus)

抄録

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.

本文言語English
論文番号113107
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
81
11
DOI
出版ステータスPublished - 2010 3月 22
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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