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Type: Artigo de periódico
Title: Coexisting on-center and off-center Yb3+ sites in Ce1-xYbxFe4P12 skutterudites
Author: Garcia, FA
Garcia, DJ
Avila, MA
Vargas, JM
Pagliuso, PG
Rettori, C
Passeggi, MCG
Oseroff, SB
Schlottmann, P
Alascio, B
Fisk, Z
Abstract: Electron-spin-resonance (ESR) measurements performed on the filled skutterudite system Ce1-xYbxFe4P12 (x less than or similar to 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 (Fe2P3)(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 Yb-171(3+)(I=1/2) isotope hyperfine splittings reveal that these two sites are associated with a low (similar to 1 GHz) and a high (greater than or similar to 15 GHz) rattling frequency, respectively. Our findings introduce Yb3+ in T-h symmetry systems and use the Yb3+ ESR as a sensitive microscopic probe to investigate the Yb3+ ions dynamics.
Subject: cerium alloys
crystal symmetry
hyperfine interactions
iron alloys
isotope effects
paramagnetic resonance
phosphorus alloys
ytterbium alloys
Country: EUA
Editor: Amer Physical Soc
Citation: Physical Review B. Amer Physical Soc, v. 80, n. 5, 2009.
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.80.052401
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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