TY - JOUR
T1 - Temperature dependence of Yb valence in the sub-surface of YbB12(001)
AU - Hagiwara, Kenta
AU - Takeno, Yusuke
AU - Ohtsubo, Yoshiyuki
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
N1 - Funding Information:
This work was performed by Photon Factory Proposal No. 2015G540. The JSPS Grant-in-Aid also supported this work for Scientific Research (B) (Grant No. 15H03676).
Publisher Copyright:
© Published under licence by IOP Publishing Ltd.
Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2017/4/6
Y1 - 2017/4/6
N2 - 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.
AB - 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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U2 - 10.1088/1742-6596/807/1/012003
DO - 10.1088/1742-6596/807/1/012003
M3 - Conference article
AN - SCOPUS:85018262056
VL - 807
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
SN - 1742-6588
IS - 1
M1 - 012003
T2 - 18th International Conference on Strongly Correlated Electron Systems, SCES 2016
Y2 - 9 May 2016 through 13 May 2016
ER -