Phonon Dynamics of Type-I Clathrate Sr8Ga16Ge30 Studied by Inelastic Neutron Scattering

被引：13
|
作者：
Lee, Chul-Ho [1 ]
Yoshizawa, Hideki [2 ]
Avila, Marcos A. [3 ]
Hase, Izumi [1 ]
Kihou, Kunihiro [1 ]
Takabatake, Toshiro [3 ]
机构：
[1] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058568, Japan
[2] Univ Tokyo, Inst Solid State Phys, Tokai, Ibaraki 3191106, Japan
[3] Hiroshima Univ, ADSM, Higashihiroshima, Hiroshima 7398530, Japan
来源：
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2008年 / 77卷
关键词：
Type-I clathrate; phonon dispersion; rattling; cage compound; inelastic neutron scattering;
D O I：
10.1143/JPSJS.77SA.260
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The phonon dynamics of type-I clathrates Sr8Ga16Ge30 have been studied at room temperature by inelastic neutron scattering. Optical phonons associated with large vibrations of Sr atoms in large tetrakaidecahedral cages, (Ga,Ge)(24), are observed at a relatively low energy of E similar to 4 meV. Analysis based on a Born-von Karman force model shows that the longitudinal force constants between the Sr atoms and the oversized cages has a small value of about 0.008 mdyn/angstrom. The results indicate that the Sr atoms are very loosely bound to the surrounding oversized cages.
引用
收藏
页码：260 / 262
页数：3
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