Observation of charge fluctuations in skutterudite compounds through an Sb-NQR measurement

H. Kotegawa; Y. Irie; H. Hidaka; T. C. Kobayashi; D. Kikuchi; H. Sugawara; H. Sato

doi:10.1016/j.physb.2007.10.226

Observation of charge fluctuations in skutterudite compounds through an Sb-NQR measurement

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

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

We report that the nuclear spin-spin relaxation rate 1 / T₂ shows characteristic peaks in the skutterudite compounds of ROs₄ Sb₁₂ (R = La, Pr, Nd, and Sm) and PrRu₄ Sb₁₂. The broadening of Sb-NQR spectrum accompanied with the peak in 1 / T₂ suggests that some charge fluctuation exists in these systems and slows down around the peak in 1 / T₂. The peaks in 1 / T₂ appear around 120 K in all the systems we measured, while the other peaks around 20 K are observed in ROs₄ Sb₁₂ (R = Pr, Nd, and Sm). The 12 Sb sites are not equivalent at low temperatures in these compounds.

Original language	English
Pages (from-to)	772-774
Number of pages	3
Journal	Physica B: Condensed Matter
Volume	403
Issue number	5-9
DOIs	https://doi.org/10.1016/j.physb.2007.10.226
Publication status	Published - Apr 1 2008

Keywords

Charge fluctuation
Heavy fermion
NQR
Skutterudite

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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10.1016/j.physb.2007.10.226

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title = "Observation of charge fluctuations in skutterudite compounds through an Sb-NQR measurement",

abstract = "We report that the nuclear spin-spin relaxation rate 1 / T2 shows characteristic peaks in the skutterudite compounds of ROs4 Sb12 (R = La, Pr, Nd, and Sm) and PrRu4 Sb12. The broadening of Sb-NQR spectrum accompanied with the peak in 1 / T2 suggests that some charge fluctuation exists in these systems and slows down around the peak in 1 / T2. The peaks in 1 / T2 appear around 120 K in all the systems we measured, while the other peaks around 20 K are observed in ROs4 Sb12 (R = Pr, Nd, and Sm). The 12 Sb sites are not equivalent at low temperatures in these compounds.",

keywords = "Charge fluctuation, Heavy fermion, NQR, Skutterudite",

author = "H. Kotegawa and Y. Irie and H. Hidaka and Kobayashi, {T. C.} and D. Kikuchi and H. Sugawara and H. Sato",

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journal = "Physica B: Condensed Matter",

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T1 - Observation of charge fluctuations in skutterudite compounds through an Sb-NQR measurement

AU - Kotegawa, H.

AU - Irie, Y.

AU - Hidaka, H.

AU - Kobayashi, T. C.

AU - Kikuchi, D.

AU - Sugawara, H.

AU - Sato, H.

PY - 2008/4/1

Y1 - 2008/4/1

N2 - We report that the nuclear spin-spin relaxation rate 1 / T2 shows characteristic peaks in the skutterudite compounds of ROs4 Sb12 (R = La, Pr, Nd, and Sm) and PrRu4 Sb12. The broadening of Sb-NQR spectrum accompanied with the peak in 1 / T2 suggests that some charge fluctuation exists in these systems and slows down around the peak in 1 / T2. The peaks in 1 / T2 appear around 120 K in all the systems we measured, while the other peaks around 20 K are observed in ROs4 Sb12 (R = Pr, Nd, and Sm). The 12 Sb sites are not equivalent at low temperatures in these compounds.

AB - We report that the nuclear spin-spin relaxation rate 1 / T2 shows characteristic peaks in the skutterudite compounds of ROs4 Sb12 (R = La, Pr, Nd, and Sm) and PrRu4 Sb12. The broadening of Sb-NQR spectrum accompanied with the peak in 1 / T2 suggests that some charge fluctuation exists in these systems and slows down around the peak in 1 / T2. The peaks in 1 / T2 appear around 120 K in all the systems we measured, while the other peaks around 20 K are observed in ROs4 Sb12 (R = Pr, Nd, and Sm). The 12 Sb sites are not equivalent at low temperatures in these compounds.

KW - Charge fluctuation

KW - Heavy fermion

KW - NQR

KW - Skutterudite

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Observation of charge fluctuations in skutterudite compounds through an Sb-NQR measurement

Abstract

Keywords

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