Abstract
Off-center rattling of La-ion in the filled skutterudite compound LaOs 4 Sb 12 has been investigated by means of ultrasonic measurements. An elastic constant C 11 shows a remarkable frequency dependence in elastic constant and ultrasonic attenuation at around 25 K. This frequency dependent ultrasonic dispersion reveals thermally activated Γ 23 -type off-center rattling of La-ion. An attempt time τ 0 = 5.0×10 -11 sec and an activation energy E = 127 K were obtained from the analysis.
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