Angle-resolved photoemission study of the mixed valence oxide V6O13: Quasi-one-dimensional electronic structure and its change across the metal-insulator transition

Ritsuko Eguchi, Takayoshi Yokoya, T. Kiss, Y. Ueda, S. Shin

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17 Citations (Scopus)

Abstract

We have performed angle-resolved photoemission spectroscopy of mixed valence oxide V6O13 that shows a metal-insulator transition (MIT) at ≃ 150 K. In the metallic phase, we observe two bands near the Fermi level (EF). One is a prominent band located around 0.8 eV and the other is a weak structure around 0.2 eV that shows dispersion toward EF only along the b axis. Furthermore, though the momentum distribution curve at EF shows a peak at kb/π=0.29±0.01 indicative of a EF crossing, the intensity of the band near EF is strongly suppressed in the region of EF. These observations indicate quasi-one-dimensional electronic states of V6O13, consistent with a highly anisotropic behavior observed from resistivity and optical conductivity measurements. Across the MIT, the band near EF shifts to higher binding energy and becomes less dispersive, resulting in opening of an energy gap of 0.2 eV. We discuss some implications of the experimental results.

Original languageEnglish
Article number205124
Pages (from-to)2051241-2051244
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume65
Issue number20
Publication statusPublished - May 15 2002
Externally publishedYes

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Metal insulator transition
Photoemission
Oxides
Electronic structure
photoelectric emission
insulators
electronic structure
Optical conductivity
valence
oxides
Electronic states
Photoelectron spectroscopy
Fermi level
Binding energy
metals
Momentum
Energy gap
binding energy
momentum
conductivity

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

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abstract = "We have performed angle-resolved photoemission spectroscopy of mixed valence oxide V6O13 that shows a metal-insulator transition (MIT) at ≃ 150 K. In the metallic phase, we observe two bands near the Fermi level (EF). One is a prominent band located around 0.8 eV and the other is a weak structure around 0.2 eV that shows dispersion toward EF only along the b axis. Furthermore, though the momentum distribution curve at EF shows a peak at kb/π=0.29±0.01 indicative of a EF crossing, the intensity of the band near EF is strongly suppressed in the region of EF. These observations indicate quasi-one-dimensional electronic states of V6O13, consistent with a highly anisotropic behavior observed from resistivity and optical conductivity measurements. Across the MIT, the band near EF shifts to higher binding energy and becomes less dispersive, resulting in opening of an energy gap of 0.2 eV. We discuss some implications of the experimental results.",
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T2 - Quasi-one-dimensional electronic structure and its change across the metal-insulator transition

AU - Eguchi, Ritsuko

AU - Yokoya, Takayoshi

AU - Kiss, T.

AU - Ueda, Y.

AU - Shin, S.

PY - 2002/5/15

Y1 - 2002/5/15

N2 - We have performed angle-resolved photoemission spectroscopy of mixed valence oxide V6O13 that shows a metal-insulator transition (MIT) at ≃ 150 K. In the metallic phase, we observe two bands near the Fermi level (EF). One is a prominent band located around 0.8 eV and the other is a weak structure around 0.2 eV that shows dispersion toward EF only along the b axis. Furthermore, though the momentum distribution curve at EF shows a peak at kb/π=0.29±0.01 indicative of a EF crossing, the intensity of the band near EF is strongly suppressed in the region of EF. These observations indicate quasi-one-dimensional electronic states of V6O13, consistent with a highly anisotropic behavior observed from resistivity and optical conductivity measurements. Across the MIT, the band near EF shifts to higher binding energy and becomes less dispersive, resulting in opening of an energy gap of 0.2 eV. We discuss some implications of the experimental results.

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