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Electron Spin Resonance (ESR) experiments in the filled Cei1-xYbxFe4P12 (x 0.0023) skutterudite compounds of Th cubic symmetry (Im3) reveal the coexistence of two distinct Yb3+ sites with large difference in their site occupation, hyperfine interaction and temperature dependence of the ESR parameters. These results suggest a scenario where the oversized (Fe2P3)4-cages of the Ce1-xYbxFe4P12 compounds are occupied with small number of on-center-Yb3+ ions and a distribution of highly occupied off-center-Yb3+ions, rattling at ~1 GHz and above ~20 GHz, respectively.

journal of physics. conference series

Experimental evidence for off-center rattling of Yb3+in the skutterudite compounds of Ce1−xYbxFe4P12