Abstract
In filled skutterudite compounds and clathrate compounds, guest atoms, which are accommodated in polyhedral cages, exhibit an anharmonic oscillation so-called the rattling motion. The rattling motion is suggested by inelastic neutron scattering experiments in filled skutterudite compound LaFe 4Sb 12. To investigate an influence of rattling motion of La atoms to the lattice system, we have measured temperature dependence of elastic modulus C 44 on a LaFe 4Sb 12 single-crystalline sample in the T range between 4.2 and 150 K for ultrasonic frequencies from 30 to 220 MHz. We found ultrasonic frequency dependence in C 44 , suggesting the rattling motion of La atoms between 30 and 80 K. We obtained a relaxation time 3.1 × 10 - 11 s and an excitation energy ∼ 300 K of the rattling motion.
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