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

页码：260 / 262

页数：3

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