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Ultrasonic dispersion and off-center rattling in heavy fermion superconductor

✍ Scribed by Yuichi Nemoto; Takafumi Ueno; Naoya Takeda; Takashi Yamaguchi; Tatsuya Yanagisawa; Terutaka Goto; Hitoshi Sugawara; Hideyuki Sato

Publisher: Elsevier Science
Year: 2006
Tongue: English
Weight: 168 KB
Volume: 378-380
Category: Article
ISSN: 0921-4526
DOI: 10.1016/j.physb.2006.01.070

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✦ Synopsis

Ultrasonic attenuation measurements have been firstly performed for a large single crystal of PrOs 4 Sb 12 with the dimensions of 5:97 Â 0:6 Â 0:6 mm 3 . Remarkable frequency dependence around 20-40 K has been observed in the elastic constant and attenuation coefficient of the longitudinal C 11 mode associated with E g symmetry strain in part, which results from a thermally activated off-center rattling with E g symmetry of a Pr ion inside a Sb icosahedron cage. Parameters of a characteristic time t 0 ¼ 3:1 Â 10 À11 s and an activation energy E ¼ 225 K were obtained. This E g rattling involving a local charge fluctuation inside a Sb cage periodically arranged may couple to the conduction electrons. As a result, the electron-phonon coupling would lead to heavy fermion and its superconductivity in PrOs 4 Sb 12 .

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