| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1815572 | Physica B: Condensed Matter | 2006 | 5 Pages |
Abstract
We have investigated an off-center local oscillator of a guest atom in cage of clathrate compounds R3Pd20Ge6 (R=La, Ce, Pr, Nd) and a filled skutterudite PrOs4Sb12 using ultrasonic measurements. The observation of ultrasonic dispersions in transverse C44 mode of R3Pd20Ge6 and in transverse (C11-C12)/2 mode of PrOs4Sb12 revealed the rattling of the off-center oscillator characterized by a relaxation time with Arrhenius-type temperature dependence. A low-temperature softening of C44 in La3Pd20Ge6 below 3Â K down to 20Â mK and a softening of (C11-C12)/2 in PrOs4Sb12 above the heavy Fermion superconducting transition indicate the charge fluctuation due to the degenerate off-center oscillators.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Terutaka Goto, Yuichi Nemoto, Takashi Yamaguchi, Tatsuya Yanagisawa, Takafumi Ueno, Tomoyuki Watanabe, Naoya Takeda, Osamu Suzuki, Hideaki Kitazawa, Hitoshi Sugawara, Hideyuki Sato,