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Experimental evidence for off-center rattling of Yb3+ in the skutterudite compounds of Ce1-xYbxFe4P 12

  • Author(s): Garcia, FA;
  • Garcia, DJ;
  • Avila, MA;
  • Vargas, JM;
  • Pagliuso, PG;
  • Rettori, C;
  • Passeggi, M;
  • Oseroff, SB;
  • Schlottmann, P;
  • Fisk, Z
  • et al.
Abstract

Electron Spin Resonance (ESR) experiments in the filled Cei 1-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 (Fe 2P3)4-cages of the Ce1-xYb xFe4P12 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. © 2010 IOP Publishing Ltd.

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