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Ultrasonic dispersion due to off-center rattling in

✍ Scribed by T. Yanagisawa; W.M. Yuhasz; P-C. Ho; M.B. Maple; H. Watanabe; Y. Yasumoto; Y. Nemoto; T. Goto

Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
673 KB
Volume
403
Category
Article
ISSN
0921-4526

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✦ Synopsis

Ultrasonic investigation for the single crystals of ferromagnetic filled skutterudite compound NdOs 4 Sb 12 was performed. A marked frequency dependence of the ultrasonic dispersion has been observed in a longitudinal elastic constant C 11 at temperature centered around 45 K; however, no dispersion was measured in the transverse elastic constant C 44 . Such a clear mode difference in the ultrasonic dispersion, which has been found in PrOs 4 Sb 12 , strongly suggests that Nd ion in NdOs 4 Sb 12 bears thermally activated off-center rattling effect.

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We have made ultrasonic measurements on a filled skutterudite PrOs 4 Sb 12 showing a heavy Fermion superconductivity at T C ΒΌ 1:85 K: The elastic constants Γ°C 11 Γ€ C 12 Þ=2 and C 44 of PrOs 4 Sb 12 exhibit low-temperature softenings below 20 K down to T C ; indicating a quadrupole fluctuation of Pr