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.
N1 - Funding Information:
We would like to acknowledge Prof. H. Harima for valuable discussions. This work was partially supported by Grant-in-Aid for Scientific Research Priority Area, Skutterudite (Nos. 15072204 and 15072202) and Scientific Research (No. 14740211) from the Ministry of Education, Culture, Sports, Science and Technology of Japan.
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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U2 - 10.1016/j.physb.2007.10.205
DO - 10.1016/j.physb.2007.10.205
M3 - Article
AN - SCOPUS:39749142151
VL - 403
SP - 1630
EP - 1632
JO - Physica B: Condensed Matter
JF - Physica B: Condensed Matter
SN - 0921-4526
IS - 5-9
ER -