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

T. Yoshino, M. Okawa, T. Kajita, S. Dash, R. Shimoyama, K. Takahashi, Y. Takahashi, R. Takayanagi, T. Saitoh, D. Ootsuki, T. Yoshida, E. Ikenaga, N. L. Saini, T. Katsufuji, T. 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
Volume95
Issue number7
DOIs
Publication statusPublished - 2017 Feb 27

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    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, 95(7), [075151]. https://doi.org/10.1103/PhysRevB.95.075151