Raman scattering investigation of skutterudite compounds
PhysicaB_383_128.pdf 106 KB
Raman scattering spectra of filled skutterudite RT4X12 (R=La, Ce, Pr, Nd, Sm and Y, T=Fe, Ru and Os, and X=Sb and P) and unfilled skutterudite CoP3 have been measured. All first-order Raman active phonons, which are due to the vibration of pnictogens, are observed. In addition, the crystal field excitations in PrRu4P12 spectra and the 2nd- order phonons including rare-earth vibrations in SmRu4P12 and ROs4Sb12 are also observed. The 2nd- order phonons can be observed for the sample with the larger cage space. The peak intensity of the 2nd- order phonons decreases with decreasing temperature and vanishes at low temperature. Such a temperature dependence suggests that the 2nd- order phonons are thermally excited and due to independent vibrations of the rare-earth ions, that is rattler motion.
Physica B : Condensed Matter
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Copyright (c) 2006 Elsevier Ltd.
Graduate School of Advanced Sciences of Matter