Electronic structure of 3 d1 configuration vanadium oxides studied by soft X-ray and hard X-ray photoemission spectroscopy

R. Eguchi, M. Taguchi, M. Matsunami, K. Horiba, K. Yamamoto, Ashish Atma Chainani, Y. Takata, M. Yabashi, D. Miwa, Y. Nishino, K. Tamasaku, T. Ishikawa, Y. Senba, H. Ohashi, I. H. Inoue, Y. Muraoka, Z. Hiroi, S. Shin

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13 Citations (Scopus)

Abstract

We investigate the electronic structure of 3 d1 configuration vanadium oxides (VO2, SrVO3 and CaVO3) using soft X-ray (SX) and hard X-ray (HX) photoemission spectroscopy (PES). The valence band spectra of VO2 in SX- and HX-PES clearly show the opening of a gap at EF across the metal-insulator transition. Spectral changes in the V 2p and O 1s core levels were also observed. In addition, 3 d1 configuration correlated metals SrVO3 and CaVO3 are typical materials whose valence band spectra are compared with dynamical mean-field theory. The V 2p and V 1s core level HX-PES of SrVO3 and CaVO3 show clear additional well-screened features. These features originate from bulk screening by a coherent band at EF. These spectra are nicely reproduced by a cluster model calculation, indicating a difference of the parameter V* for the interaction strength between the central V 3d orbitals and the coherent band.

Original languageEnglish
Pages (from-to)421-425
Number of pages5
JournalJournal of Electron Spectroscopy and Related Phenomena
Volume156-158
DOIs
Publication statusPublished - 2007 May 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry

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