Kiyofumi Nitta et al 2009 J. Phys.: Conf. Ser. 190 012098 doi:10.1088/1742-6596/190/1/012098
Kiyofumi Nitta1, Yusuke Omori2, Takafumi Miyanaga2, Katsuhiko Takegahara2, Hitoshi Sugawara3, Daisuke Kikuchi4 and Hideyuki Sato4
Show affiliationsThe filled skutterudites RT4X12 (R: rare-earth, T: transition metal, X: pnictogen) show a variety of intriguing features by changing the combination of R, T, and X. Among them, some compounds shows characteristic feature called "rattling" that is considered as anharmonic oscillation or off-centered motion of rare-earth ions accommodated in the icosahedron cages made from pnictogen and "rattling" is suggested to contribute to the various features of this system. We applied extended X-ray absorption fine structure (EXAFS) on this system to clarify the microscopic mechanism of "rattling" motion [1]. Temperature dependence of EXAFS thermal (Debye-Waller) factors of R-Sb and T-Sb atomic pairs were analyzed by Einstein model. Thermal oscillation and static distortion are analyzed independently. From this study, we could know systematic information about "rattling" as a large amplitude oscillation of rare-earth ions and static distortion that has two types of cage space dependence.
61.05.cj X-ray absorption spectroscopy: EXAFS, NEXAFS, XANES, etc.
Issue 1 (2009)
Kiyofumi Nitta et al 2009 J. Phys.: Conf. Ser. 190 012098
Yoshiki Matsuda et al 2008 J. Phys. A: Math. Theor. 41 324012
J Y Peter Ko et al 2009 J. Phys.: Conf. Ser. 190 012078
Szymon Niewieczerzał and Marek Cieplak 2009 J. Phys.: Condens. Matter 21 474221
C L Farrow et al 2007 J. Phys.: Condens. Matter 19 335219
Sergio Di Matteo 2009 J. Phys.: Conf. Ser. 190 012008
Baris Emre et al 2009 Phys. Scr. 80 055703
L Schlicker et al 2009 Nanotechnology 20 495702
Ma Hai-Lin and Fan Duo-Wang 2009 Chinese Phys. Lett. 26 117302
A.K. Hui et al 2009 Nucl. Fusion 49 115025