Coexisting on-center and off-center Yb3+ sites in Ce1−xYbxFe4P12 skutterudites
In: Physical Review B, Jg. 80 (2009-08-01), Heft 5
Online
academicJournal
- 052401
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.
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Coexisting on-center and off-center Yb3+ sites in Ce1−xYbxFe4P12 skutterudites
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| Autor/in / Beteiligte Person: | Garcia, FA ; Garcia, DJ ; Avila, MA ; Vargas, JM ; Pagliuso, PG ; Rettori, C ; Passeggi, MCG ; Oseroff, SB ; Schlottmann, P ; Alascio, B ; Fisk, Z |
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| Zeitschrift: | Physical Review B, Jg. 80 (2009-08-01), Heft 5 |
| Veröffentlichung: | eScholarship, University of California, 2009 |
| Medientyp: | academicJournal |
| Umfang: | 052401 |
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