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.
|ジャーナル||Journal of Physics: Conference Series|
|出版ステータス||Published - 2017 4 6|
|イベント||18th International Conference on Strongly Correlated Electron Systems, SCES 2016 - Hangzhou, China|
継続期間: 2016 5 9 → 2016 5 13
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