Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 77, Issue -, Pages 260-262Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJS.77SA.260
Keywords
Type-I clathrate; phonon dispersion; rattling; cage compound; inelastic neutron scattering
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Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan [15072201, 18204032]
- Ministry of Economy, Trade and Industry of Japan
- Grants-in-Aid for Scientific Research [15072201] Funding Source: KAKEN
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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.
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