Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5397121 | Journal of Electron Spectroscopy and Related Phenomena | 2007 | 5 Pages |
Abstract
We investigate the electronic structure of 3d1 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, 3d1 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 Vâ for the interaction strength between the central V 3d orbitals and the coherent band.
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Authors
R. Eguchi, M. Taguchi, M. Matsunami, K. Horiba, K. Yamamoto, A. 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,