Temperature dependence of Yb valence in the sub-surface of YbB12(001)

Kenta Hagiwara; Yusuke Takeno; Yoshiyuki Ohtsubo; Ryu Yukawa; Masaki Kobayashi; Koji Horiba; Hiroshi Kumigashira; Julien Rault; Patrick Le Fevre; Francois Bertran; Amina Taleb-Ibrahimi; Fumitoshi Iga; Shin Ichi Kimura

doi:10.1088/1742-6596/807/1/012003

Temperature dependence of Yb valence in the sub-surface of YbB₁₂(001)

Kenta Hagiwara, Yusuke Takeno, Yoshiyuki Ohtsubo, Ryu Yukawa, Masaki Kobayashi, Koji Horiba, Hiroshi Kumigashira, Julien Rault, Patrick Le Fevre, Francois Bertran, Amina Taleb-Ibrahimi, Fumitoshi Iga, Shin Ichi Kimura

Research output: Contribution to journal › Conference article

3 Citations (Scopus)

Abstract

The typical Kondo insulator, YbB₁₂, is a candidate of topological Kondo insulators. To clarify the surface electronic structure of not only bulk but also surface by photoelectron measurements, we developed a method to obtain a clean surface of YbB₁₂(001) by annealing at 1650 K in an ultra-high vacuum. By surface-sensitive photoelectron measurements, it was known that the surface consists of only B atoms without Yb. In the sub-surface region, Yb atoms exist and the temperature dependence of the valence agrees with those of previous HAXPES results. Here we report the cleaning method to obtain well-defined YbB₁₂(001) surfaces and the temperature-dependent Yb valence obtained from Yb 3d core-level and valence photoelectron spectra.

Original language	English
Article number	012003
Journal	Journal of Physics: Conference Series
Volume	807
Issue number	1
DOIs	https://doi.org/10.1088/1742-6596/807/1/012003
Publication status	Published - 2017 Apr 6
Externally published	Yes
Event	18th International Conference on Strongly Correlated Electron Systems, SCES 2016 - Hangzhou, China Duration: 2016 May 9 → 2016 May 13

ASJC Scopus subject areas

Physics and Astronomy(all)

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Hagiwara, K., Takeno, Y., Ohtsubo, Y., Yukawa, R., Kobayashi, M., Horiba, K., Kumigashira, H., Rault, J., Le Fevre, P., Bertran, F., Taleb-Ibrahimi, A., Iga, F., & Kimura, S. I. (2017). Temperature dependence of Yb valence in the sub-surface of YbB₁₂(001). Journal of Physics: Conference Series, 807(1), [012003]. https://doi.org/10.1088/1742-6596/807/1/012003

Temperature dependence of Yb valence in the sub-surface of YbB₁₂(001). / Hagiwara, Kenta; Takeno, Yusuke; Ohtsubo, Yoshiyuki; Yukawa, Ryu; Kobayashi, Masaki; Horiba, Koji; Kumigashira, Hiroshi; Rault, Julien; Le Fevre, Patrick; Bertran, Francois; Taleb-Ibrahimi, Amina; Iga, Fumitoshi; Kimura, Shin Ichi.

In: Journal of Physics: Conference Series, Vol. 807, No. 1, 012003, 06.04.2017.

Research output: Contribution to journal › Conference article

Hagiwara, Kenta ; Takeno, Yusuke ; Ohtsubo, Yoshiyuki ; Yukawa, Ryu ; Kobayashi, Masaki ; Horiba, Koji ; Kumigashira, Hiroshi ; Rault, Julien ; Le Fevre, Patrick ; Bertran, Francois ; Taleb-Ibrahimi, Amina ; Iga, Fumitoshi ; Kimura, Shin Ichi. / Temperature dependence of Yb valence in the sub-surface of YbB₁₂(001). In: Journal of Physics: Conference Series. 2017 ; Vol. 807, No. 1.

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abstract = "The typical Kondo insulator, YbB12, is a candidate of topological Kondo insulators. To clarify the surface electronic structure of not only bulk but also surface by photoelectron measurements, we developed a method to obtain a clean surface of YbB12(001) by annealing at 1650 K in an ultra-high vacuum. By surface-sensitive photoelectron measurements, it was known that the surface consists of only B atoms without Yb. In the sub-surface region, Yb atoms exist and the temperature dependence of the valence agrees with those of previous HAXPES results. Here we report the cleaning method to obtain well-defined YbB12(001) surfaces and the temperature-dependent Yb valence obtained from Yb 3d core-level and valence photoelectron spectra.",

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AU - Hagiwara, Kenta

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AU - Yukawa, Ryu

AU - Kobayashi, Masaki

AU - Horiba, Koji

AU - Kumigashira, Hiroshi

AU - Rault, Julien

AU - Le Fevre, Patrick

AU - Bertran, Francois

AU - Taleb-Ibrahimi, Amina

AU - Iga, Fumitoshi

AU - Kimura, Shin Ichi

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