Temperature-dependent evolution of Ti 3d spectral features at surface of BaxTi8 O16

S. Dash, H. Enomoto, T. Kajita, K. Ono, K. Horiba, M. Kobayashi, H. Kumigashira, V. Kandyba, A. Giampietri, A. Barinov, F. Stramaglia, N. L. Saini, T. Katsufuji, T. Mizokawa

Research output: Contribution to journalArticle

Abstract

We have studied temperature-driven effects on photoemission spectra of hollandite-type BaxTi8O16+δ across its metal-insulator transition (MIT) at 220 K by using surface-sensitive photon energies from 27 to 70 eV. The surface Ti 3d spectral weight was suppressed and shifted towards higher binding energy from the bulk if the surface was obtained by cleavage above the MIT temperature. The Ti 3d spectral weight was recovered once the sample was cooled across the MIT, indicating a transfer of Ti 3d electrons from the bulk to the surface across the MIT. The recovered Ti 3d spectral shape is consistent with the bulk-sensitive result and indicates strong localization character of the Ti 3d electron even in the metallic phase. Resonant photoemission spectroscopy with absorption from the Ti 3p core level exhibits resonances of the O 2p-Ti 3d and O 2p-Ti 4s,p hybridized states. The result suggests that the O 2p-Ti 4s,p hybridization plays a role in the interplay between the bulk and the surface in BaxTi8O16+δ.

Original languageEnglish
Article number125153
JournalPhysical Review B
Volume100
Issue number12
DOIs
Publication statusPublished - 2019 Sep 24

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Metal insulator transition
insulators
metals
photoelectric emission
Temperature
temperature
Core levels
Electrons
Photoemission
Photoelectron spectroscopy
Binding energy
Thermal effects
Superconducting transition temperature
cleavage
electrons
Photons
binding energy
transition temperature
photons
spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Temperature-dependent evolution of Ti 3d spectral features at surface of BaxTi8 O16+δ. / Dash, S.; Enomoto, H.; Kajita, T.; Ono, K.; Horiba, K.; Kobayashi, M.; Kumigashira, H.; Kandyba, V.; Giampietri, A.; Barinov, A.; Stramaglia, F.; Saini, N. L.; Katsufuji, T.; Mizokawa, T.

In: Physical Review B, Vol. 100, No. 12, 125153, 24.09.2019.

Research output: Contribution to journalArticle

Dash, S, Enomoto, H, Kajita, T, Ono, K, Horiba, K, Kobayashi, M, Kumigashira, H, Kandyba, V, Giampietri, A, Barinov, A, Stramaglia, F, Saini, NL, Katsufuji, T & Mizokawa, T 2019, 'Temperature-dependent evolution of Ti 3d spectral features at surface of BaxTi8 O16', Physical Review B, vol. 100, no. 12, 125153. https://doi.org/10.1103/PhysRevB.100.125153
Dash S, Enomoto H, Kajita T, Ono K, Horiba K, Kobayashi M et al. Temperature-dependent evolution of Ti 3d spectral features at surface of BaxTi8 O16. Physical Review B. 2019 Sep 24;100(12). 125153. https://doi.org/10.1103/PhysRevB.100.125153
Dash, S. ; Enomoto, H. ; Kajita, T. ; Ono, K. ; Horiba, K. ; Kobayashi, M. ; Kumigashira, H. ; Kandyba, V. ; Giampietri, A. ; Barinov, A. ; Stramaglia, F. ; Saini, N. L. ; Katsufuji, T. ; Mizokawa, T. / Temperature-dependent evolution of Ti 3d spectral features at surface of BaxTi8 O16. In: Physical Review B. 2019 ; Vol. 100, No. 12.
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