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

S. Dash; T. Kajita; M. Okawa; T. Saitoh; E. Ikenaga; N. L. Saini; T. Katsufuji; T. Mizokawa

doi:10.1103/PhysRevB.97.165116

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

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

School of Advanced Science and Engineering

Research output: Contribution to journal › Article › peer-review

7 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 language	English
Article number	165116
Journal	Physical Review B
Volume	97
Issue number	16
DOIs	https://doi.org/10.1103/PhysRevB.97.165116
Publication status	Published - 2018 Apr 10

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.97.165116

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

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.",

author = "S. Dash and T. Kajita and M. Okawa and T. Saitoh and E. Ikenaga and Saini, {N. L.} and T. Katsufuji and T. Mizokawa",

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T1 - Anomalous metallic state with strong charge fluctuations in BaxTi8 O16+δ revealed by hard x-ray photoemission spectroscopy

AU - Dash, S.

AU - Kajita, T.

AU - Okawa, M.

AU - Saitoh, T.

AU - Ikenaga, E.

AU - Saini, N. L.

AU - Katsufuji, T.

AU - Mizokawa, T.

PY - 2018/4/10

Y1 - 2018/4/10

N2 - 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.

AB - 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.

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

Abstract

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