TY - JOUR
T1 - Electronic structure of 3 d1 configuration vanadium oxides studied by soft X-ray and hard X-ray photoemission spectroscopy
AU - Eguchi, R.
AU - Taguchi, M.
AU - Matsunami, M.
AU - Horiba, K.
AU - Yamamoto, K.
AU - Chainani, A.
AU - Takata, Y.
AU - Yabashi, M.
AU - Miwa, D.
AU - Nishino, Y.
AU - Tamasaku, K.
AU - Ishikawa, T.
AU - Senba, Y.
AU - Ohashi, H.
AU - Inoue, I. H.
AU - Muraoka, Y.
AU - Hiroi, Z.
AU - Shin, S.
PY - 2007/5
Y1 - 2007/5
N2 - 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.
AB - 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.
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U2 - 10.1016/j.elspec.2006.12.055
DO - 10.1016/j.elspec.2006.12.055
M3 - Article
AN - SCOPUS:34247174290
SN - 0368-2048
VL - 156-158
SP - 421
EP - 425
JO - Journal of Electron Spectroscopy and Related Phenomena
JF - Journal of Electron Spectroscopy and Related Phenomena
ER -