YbT2Zn20 (T: Rh and Ir), which crystallizes in the cubic CeCr2Al20-type structure, is a member of the well-known heavy fermion compounds, indicating a huge electronic specific heat coefficient γ ≃ 500 mJ/(K2·mol). We have measured temperature and magnetic field dependences of Yb valence in YbT2Zn20 (T: Rh and Ir) at ambient pressure by the Lm edge x- ray absorption spectroscopy in order to investigate the valence state of Yb 4f electrons in these compounds. It is revealed that the Yb valence in both compounds significantly decreases with temperature below about 100 K and increases with increasing magnetic field at low temperatures in contrast to the case of YbCo2Zn20.
|ジャーナル||Journal of Physics: Conference Series|
|出版ステータス||出版済み - 2014|
|イベント||2014 International Conference on Strongly Correlated Electron Systems, SCES 2014 - Grenoble, フランス|
継続期間: 7 7 2014 → 7 14 2014
All Science Journal Classification (ASJC) codes