Anomalous metallic state with strong charge fluctuations in BaxTi8 O16+δ revealed by hard x-ray photoemission spectroscopy

S. Dash, Tomomasa Kajita, M. Okawa, T. Saitoh, E. Ikenaga, N. L. Saini, Takuro Katsufuji, Takashi Mizokawa

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    We have studied a charge-orbital driven metal-insulator transition (MIT) in hollandite-type BaxTi8O16+δ by means of hard x-ray photoemission spectroscopy (HAXPES). The Ti 2p HAXPES indicates strong Ti3+/Ti4+ charge fluctuation in the metallic phase above the MIT temperature. The metallic phase is characterized by a power-law spectral function near the Fermi level which would be a signature of bad metal with non-Drude polaronic behavior. The power-law spectral shape is associated with the large Seebeck coefficient of the metallic phase in BaxTi8O16+δ.

    Original languageEnglish
    Article number165116
    JournalPhysical Review B
    Volume97
    Issue number16
    DOIs
    Publication statusPublished - 2018 Apr 10

    Fingerprint

    Metal insulator transition
    Photoelectron spectroscopy
    photoelectric emission
    X rays
    Seebeck coefficient
    Fermi level
    insulators
    metals
    spectroscopy
    Superconducting transition temperature
    x rays
    Metals
    Seebeck effect
    transition temperature
    signatures
    orbitals

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

    Cite this

    Anomalous metallic state with strong charge fluctuations in BaxTi8 O16+δ revealed by hard x-ray photoemission spectroscopy. / Dash, S.; Kajita, Tomomasa; Okawa, M.; Saitoh, T.; Ikenaga, E.; Saini, N. L.; Katsufuji, Takuro; Mizokawa, Takashi.

    In: Physical Review B, Vol. 97, No. 16, 165116, 10.04.2018.

    Research output: Contribution to journalArticle

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    AU - Kajita, Tomomasa

    AU - Okawa, M.

    AU - Saitoh, T.

    AU - Ikenaga, E.

    AU - Saini, N. L.

    AU - Katsufuji, Takuro

    AU - Mizokawa, Takashi

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