Ru-NQR studies on filled skutterudite compounds R Ru4 P12 (R = La, Nd, Sm)

S. Masaki; T. Mito; M. Takemura; S. Wada; H. Harima; D. Kikuchi; H. Sato; H. Sugawara; N. Takeda; G. q. Zheng

doi:10.1016/j.physb.2007.10.205

Ru-NQR studies on filled skutterudite compounds R Ru₄ P₁₂ (R = La, Nd, Sm)

S. Masaki, T. Mito, M. Takemura, S. Wada, H. Harima, D. Kikuchi, H. Sato, H. Sugawara, N. Takeda, G. q. Zheng

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

Abstract

We report nuclear quadrupole resonance (NQR) studies on Ru-sites of filled skutterudite compounds R Ru₄ P₁₂ (R = La, Nd, Sm) in zero magnetic field. For NdRu₄ P₁₂, the ¹⁰¹Ru-NQR signal disappears below T_C = 1.6 K, which is indicative of the transformation into the ferromagnetically ordered ground state. For SmRu₄ P₁₂, a single ¹⁰¹Ru-NQR line splits into two lines below the metal-insulator transition temperature T_MI = 16.5 K with the intensity ratio of 3 : 1. This result gives evidence that there are two inequivalent Ru-sites with different electric field gradient. The intensity ratio leads to a conclusion that the symmetry is lowered below T_MI from a cubic Im over(3, -) space group to a trigonal R over(3, -) one.

Original language	English
Pages (from-to)	1630-1632
Number of pages	3
Journal	Physica B: Condensed Matter
Volume	403
Issue number	5-9
DOIs	https://doi.org/10.1016/j.physb.2007.10.205
Publication status	Published - Apr 1 2008

Keywords

Filled skutterudite
Metal-insulator transition
NQR
SmRu P

ASJC Scopus subject areas

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

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@article{416f6051f2694d77966618da75d863e9,

title = "Ru-NQR studies on filled skutterudite compounds R Ru4 P12 (R = La, Nd, Sm)",

abstract = "We report nuclear quadrupole resonance (NQR) studies on Ru-sites of filled skutterudite compounds R Ru4 P12 (R = La, Nd, Sm) in zero magnetic field. For NdRu4 P12, the 101Ru-NQR signal disappears below TC = 1.6 K, which is indicative of the transformation into the ferromagnetically ordered ground state. For SmRu4 P12, a single 101Ru-NQR line splits into two lines below the metal-insulator transition temperature TMI = 16.5 K with the intensity ratio of 3 : 1. This result gives evidence that there are two inequivalent Ru-sites with different electric field gradient. The intensity ratio leads to a conclusion that the symmetry is lowered below TMI from a cubic Im over(3, -) space group to a trigonal R over(3, -) one.",

keywords = "Filled skutterudite, Metal-insulator transition, NQR, SmRu P",

author = "S. Masaki and T. Mito and M. Takemura and S. Wada and H. Harima and D. Kikuchi and H. Sato and H. Sugawara and N. Takeda and Zheng, {G. q.}",

year = "2008",

month = apr,

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doi = "10.1016/j.physb.2007.10.205",

language = "English",

volume = "403",

pages = "1630--1632",

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TY - JOUR

T1 - Ru-NQR studies on filled skutterudite compounds R Ru4 P12 (R = La, Nd, Sm)

AU - Masaki, S.

AU - Mito, T.

AU - Takemura, M.

AU - Wada, S.

AU - Harima, H.

AU - Kikuchi, D.

AU - Sato, H.

AU - Sugawara, H.

AU - Takeda, N.

AU - Zheng, G. q.

PY - 2008/4/1

Y1 - 2008/4/1

N2 - We report nuclear quadrupole resonance (NQR) studies on Ru-sites of filled skutterudite compounds R Ru4 P12 (R = La, Nd, Sm) in zero magnetic field. For NdRu4 P12, the 101Ru-NQR signal disappears below TC = 1.6 K, which is indicative of the transformation into the ferromagnetically ordered ground state. For SmRu4 P12, a single 101Ru-NQR line splits into two lines below the metal-insulator transition temperature TMI = 16.5 K with the intensity ratio of 3 : 1. This result gives evidence that there are two inequivalent Ru-sites with different electric field gradient. The intensity ratio leads to a conclusion that the symmetry is lowered below TMI from a cubic Im over(3, -) space group to a trigonal R over(3, -) one.

AB - We report nuclear quadrupole resonance (NQR) studies on Ru-sites of filled skutterudite compounds R Ru4 P12 (R = La, Nd, Sm) in zero magnetic field. For NdRu4 P12, the 101Ru-NQR signal disappears below TC = 1.6 K, which is indicative of the transformation into the ferromagnetically ordered ground state. For SmRu4 P12, a single 101Ru-NQR line splits into two lines below the metal-insulator transition temperature TMI = 16.5 K with the intensity ratio of 3 : 1. This result gives evidence that there are two inequivalent Ru-sites with different electric field gradient. The intensity ratio leads to a conclusion that the symmetry is lowered below TMI from a cubic Im over(3, -) space group to a trigonal R over(3, -) one.

KW - Filled skutterudite

KW - Metal-insulator transition

KW - NQR

KW - SmRu P

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