Connection between Charge Fluctuations and the Coherent Temperature in the Heavy-Fermion System SmOs4Sb12: A Sb121,123 NQR Study

H. Kotegawa, H. Hidaka, T. C. Kobayashi, D. Kikuchi, H. Sugawara, H. Sato

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Abstract

We report Sb121,123 nuclear quadrupole resonance measurements under pressure in a novel heavy fermion (HF) system SmOs4Sb12. The nuclear spin-spin relaxation rate 1/T2 exhibits a distinct peak near the coherent temperature of the Kondo effect. The isotope effect of Sb121 and Sb123 indicates that the peak in 1/T2 is electrical in origin. The connection between the peak in 1/T2 and the development of coherency of the Kondo effect is robust even under pressure. It is conjectured that charge fluctuation plays an important role in forming the HF state in SmOs4Sb12.

Original languageEnglish
Article number156408
JournalPhysical Review Letters
Volume99
Issue number15
DOIs
Publication statusPublished - Oct 12 2007

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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