Electric Field Gradient Fluctuations in Filled Skutterudite ReRu sub( 4)Sb sub( 12) (Re = La, Ce, and Pr) Probed by Sb-NQR

We have carried out ... Sb nuclear quadrupole resonance (NQR) measurements on Re Ru ... Sb ... ( Re = La, Ce and Pr) to investigate an anomalous behavior of the nuclear spin-echo relaxation rate 1/ T ... observed in Re Os ... Sb ... . The full width at half maximum of the NQR spectrum shows a step-l...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2011-01, Vol.80, p.1-1
Main Authors: Yogi, Mamoru, Niki, Haruo, Sugawara, Hitoshi, Takeda, Naoya, Sato, Hideyuki
Format: Article
Language:English
Subjects:
Antimony
Cage
Crystal structure
Electric fields
Fluctuation
Rare earth metals
Spin-lattice relaxation
Temperature dependence
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Summary:We have carried out ... Sb nuclear quadrupole resonance (NQR) measurements on Re Ru ... Sb ... ( Re = La, Ce and Pr) to investigate an anomalous behavior of the nuclear spin-echo relaxation rate 1/ T ... observed in Re Os ... Sb ... . The full width at half maximum of the NQR spectrum shows a step-like increase below 130 K with decreasing temperature. Temperature dependence of 1/ T ... also shows a divergence at ~115 K whereas the nuclear spin-lattice relaxation rate 1/ T ... does not show any anomaly. These results are caused by a distribution of the electric field gradient (EFG) and its fluctuations, which might arise from a rattling motion of the rare earth ion centered in the cage which consists of twelve Sb and/or a small deformation of the cage. The EFG fluctuations observed in Re Os ... Sb ... and Re Ru ... Sb ... at T ~120 K originates from an unique crystal structure of the filled skutterudite with oversized Sb-cage. (ProQuest: ... denotes formulae/symbols omitted.)
ISSN:0031-9015
1347-4073