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ID 57013
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Muraoka, Yuji Research Institute for Interdisciplinary Science, Okayama University
Nagao, Hiroki Graduate School of Natural Science and Technology, Okayama University
Yao, Yuichiro Graduate School of Natural Science and Technology, Okayama University
Wakita, Takanori Research Institute for Interdisciplinary Science, Okayama University
Terashima, Kensei Research Institute for Interdisciplinary Science, Okayama University
Yokoya, Takayoshi Research Institute for Interdisciplinary Science, Okayama University
Kumigashira, Hiroshi High Energy Accelerator Research Organization (KEK), Photon Factory
Oshima , Masaharu The Institute for Solid State Physics, The University of Tokyo
Abstract
Since the first observation of the metal-to-insulator transition (MIT), VO2 has attracted substantial attention in terms of whether this transition is impelled by electron-phonon interaction (Peierls transition) or electron-electron interaction. Regarding Peierls transition, it has been theoretically predicted that the Fermi surface (FS) cross-section exhibits certain nesting features for a metallic phase of VO2. Various experimental studies related to the nesting feature have been reported. Nevertheless, there is no experimental result on FS topology. In this work, we determine the FS topology of the metallic phase of VO2 through studies of VO2 epitaxial thin films on TiO2(001) substrates, using synchrotron radiation angle-resolved photoemission spectroscopy (ARPES). Three electron pockets around Γ are observed in band structures along the Γ-X direction. These three bands form electron surfaces around Γ in the ΓXRZ plane. Furthermore, the lowest energy band FS exhibits the nesting feature corresponding to a nesting vector [Formula: see text] = ΓR, as predicted by the calculation. Our results strongly indicate the formation of the charge-density wave with [Formula: see text] = ΓR and thus, the importance of Peierls transition for the mechanism of the MIT in VO2.
Published Date
2018-12
Publication Title
Scientific Reports
Volume
volume8
Issue
issue1
Publisher
Nature Publishing Group
Start Page
17906
ISSN
2045-2322
Content Type
Journal Article
language
英語
OAI-PMH Set
岡山大学
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DOI
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isVersionOf https://doi.org/10.1038/s41598-018-36281-8