Off-center Rattling and Tunneling in Filled Skutterudite LaOs4Sb12

被引：7
|
作者：
Yasumoto, Yuri [1 ]
Yamaguchi, Akio [1 ]
Yanagisawa, Tatsuya [1 ]
Nemoto, Yuichi [1 ]
Goto, Terutaka [1 ]
Ochiai, Akira [2 ]
机构：
[1] Niigata Univ, Grad Sch Sci & Technol, Niigata 9502181, Japan
[2] Tohoku Univ, Grad Sch Sci, Sendai, Miyagi 9808578, Japan
来源：
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2008年 / 77卷
关键词：
filled skutterudite; elastic constant; ultrasonic attenuation; off-center; rattling;
D O I：
10.1143/JPSJS.77SA.242
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Off-center rattling of La-ion in the filled skutterudite compound LaOs4Sb12 has been investigated by means of ultrasonic measurements. An elastic constant C-11 shows a remarkable frequency dependence in elastic constant and ultrasonic attenuation at around 25 K. This frequency dependent ultrasonic dispersion reveals thermally activated Gamma(23)-type off-center rattling of La-ion. An attempt time tau(0) = 5.0x10(-11) sec and an activation energy E = 127 K were obtained from the analysis.
引用
收藏
页码：242 / 244
页数：3
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