| Autor: |
Matsunami, M., Oura, M., Tamasaku, K., Ishikawa, T., Ideta, S., Tanaka, K., Takeuchi, T., Yamada, T., Tsai, A. P., Imura, K., Deguchi, K., Sato, N. K., Ishimasa, T. |
| Rok vydání: |
2017 |
| Předmět: |
|
| Zdroj: |
Phys. Rev. B 96, 241102(R) (2017) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevB.96.241102 |
| Popis: |
We study the electronic structure of Tsai-type cluster-based quasicrystalline approximants, Au$_{64}$Ge$_{22}$Yb$_{14}$ (AGY-I), Au$_{63.5}$Ge$_{20.5}$Yb$_{16}$ (AGY-II), and Zn$_{85.4}$Yb$_{14.6}$ (Zn-Yb), by means of photoemission spectroscopy. In the valence band hard x-ray photoemission spectra of AGY-II and Zn-Yb, we separately observe a fully occupied Yb 4$f$ state and a valence fluctuation derived Kondo resonance peak, reflecting two inequivalent Yb sites, a single Yb atom in the cluster center and its surrounding Yb icosahedron, respectively. The fully occupied 4$f$ signal is absent in AGY-I containing no Yb atom in the cluster center. The results provide direct evidence for a heterogeneous valence state in AGY-II and Zn-Yb. |
| Databáze: |
arXiv |
| Externí odkaz: |
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