Unusual valence state and metal-insulator transition in BaV10 O15 probed by hard x-ray photoemission spectroscopy

T. Yoshino, M. Okawa, Tomomasa Kajita, S. Dash, R. Shimoyama, K. Takahashi, Y. Takahashi, R. Takayanagi, T. Saitoh, D. Ootsuki, T. Yoshida, E. Ikenaga, N. L. Saini, Takuro Katsufuji, Takashi Mizokawa

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    Abstract

    We have studied the electronic structure of BaV10O15 across the metal-insulator transition with V trimerization by means of hard-x-ray photoemission spectroscopy (HAXPES) and mean-field calculations. The V 2p HAXPES indicates V2.5+-V3+ charge fluctuation in the metallic phase, and V2+-V3+ charge order in the insulating phase. The V2.5+-V3+ charge fluctuation is consistent with the mean-field solution where a V 3d a1g electron is shared by two V sites with face-sharing VO6 octahedra. The valence-band HAXPES of the metallic phase exhibits pseudogap opening at the Fermi level associated with the charge fluctuation, and a band gap ∼200 meV is established in the insulating phase due to the switching of charge correlation.

    Original languageEnglish
    Article number075151
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume95
    Issue number7
    DOIs
    Publication statusPublished - 2017 Feb 27

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    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

    Cite this

    Yoshino, T., Okawa, M., Kajita, T., Dash, S., Shimoyama, R., Takahashi, K., Takahashi, Y., Takayanagi, R., Saitoh, T., Ootsuki, D., Yoshida, T., Ikenaga, E., Saini, N. L., Katsufuji, T., & Mizokawa, T. (2017). Unusual valence state and metal-insulator transition in BaV10 O15 probed by hard x-ray photoemission spectroscopy. Physical Review B - Condensed Matter and Materials Physics, 95(7), [075151]. https://doi.org/10.1103/PhysRevB.95.075151