Skip to main content
eScholarship
Open Access Publications from the University of California

Coexisting on-center and off-center Yb3+ sites in Ce1-x Ybx Fe4 P12 skutterudites

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

Electron-spin-resonance (ESR) measurements performed on the filled skutterudite system Ce1-x Ybx Fe4 P12 (x≲0.003) unequivocally reveal the coexistence of two Yb3+ resonances associated with sites of considerably different occupations and temperature behaviors. Detailed analysis of the ESR data suggests a scenario where the fraction of oversized (Fe2 P3) 4 cages that host Yb ions are filled with a low occupation of on-center Yb3+ sites and a highly occupied T -dependent distribution of off-center Yb3+ sites. Analysis of the Y 171 b3+ (I=1/2) isotope hyperfine splittings reveal that these two sites are associated with a low (∼1 GHz) and a high (≲ 15 GHz) rattling frequency, respectively. Our findings introduce Yb3+ in Th symmetry systems and use the Yb3+ ESR as a sensitive microscopic probe to investigate the Yb3+ ions dynamics. © 2009 The American Physical Society.

Many UC-authored scholarly publications are freely available on this site because of the UC Academic Senate's Open Access Policy. Let us know how this access is important for you.

Main Content
Current View