Elastic properties of Sr8Ga16Ge30

Authors :: Ishii, I.
Higaki, H.
Morita, S.
Avila, M.A.
Sakata, T.
Takabatake, T.
Suzuki, T.
Source :: Physica B. Aug2006, Vol. 383 Issue 1, p130-131. 2p.
Publication Year :: 2006
Abstract: Abstract: The clathrate compound with the type-I cubic structure is expected to show the rattling motion of Sr atom which is an anomalous off-center oscillation. To investigate an influence of the rattling motion to the lattice system, we have measured temperature T dependence of elastic modulus and ultrasonic attenuation of a single-crystalline sample in the T range between 4.2 and 150K. We found a frequency dependence in and suggesting the rattling motion of Sr atoms between 20 and 60K. We obtained the relaxation time and the excitation energy 285K of the rattling motion. [Copyright &y& Elsevier]