XPS study of rare earth dodecaborides: TmB12, YbB12 and LuB12 |
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| Authors: | F. Iga Y. Takakuwa T. Takahashi M. Kasaya T. Kasuya T. Sagawa |
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| Affiliation: | 1. Department of Physics, Tohoku University, Sendai 980, Japan;1. Research Institute of Electrical Communications, Tohoku University, Sendai 980, Japan |
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| Abstract: | Single phase TmB12, YbB12 and LuB12 were successfully obtained by the arc-melting and floating zone methods. The XPS measurements of these compounds have indicated that (1) only YbB12 is a valence fluctuating compound with the valency of +2.9 at room temperature, (2) the correlation energy between Yb2+ and Yb3+ ions is about 6.0 eV, (3) Tm and Lu ions in the dodecaborides are in a trivalent state, and (4) the binding energy of the 4f level in TmB12 and LuB12 is 5.0 and 7.7 eV, respectively. |
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