75As-NQR studies of superconducting filled skutterudites PrRu4As12 and LaRu4As12

被引：11
|
作者：
Shimizu, Masahiro [1 ]
Amanuma, Hideaki
Hachitani, Kenichi
Fukazawa, Hideto
Kohori, Yoh
Namiki, Takahiro
Sekine, Chihiro
Shirotani, Ichimin
机构：
[1] Chiba Univ, Grad Sch Sci, Dept Phys, Chiba 2638522, Japan
[2] Muroran Inst Technol, Dept Elect & Elect Engn, Muroran, Hokkaido 0508585, Japan
来源：
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2007年 / 76卷 / 10期
关键词：
PrRu4As12; LaRu4As12; As-75-NQR; superconductivity; filled skutterudites;
D O I：
10.1143/JPSJ.76.104705
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We report As-75 nuclear quadrupole resonance (NQR) measurements of the filled skutterudite superconductors LaRu4As12 and PrRu4As12. The temperature dependence of the As-75-NQR line and the nuclear spin-lattice relaxation rate 1/T-1 show that Pr3+ has a crystal electric field (CEF) singlet ground state with a separate first excited state. In the superconducting states of PrRu4As12 and LaRu4As12, 1 IT, has a coherence peak just below the transition temperature and decreases exponentially at low temperatures. This behavior shows that the s-wave superconductivity occurs in both compounds.
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页数：4
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