Raman scattering study of the guest ion motion in caged crystals

Y. Takasu, T. Hasegawa, N. Ogita, M. Udagawa, M. A. Avila, K. Suekuni, T. Takabatake, T. Yamaguchi, T. Watanabe, Y. Nemoto, T. Goto, Z. Hiroi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


The guest ion motion has been investigated by Raman scattering for the following caged crystals: La3Pd20X6 (X=Ge, Si), X8Ga16Ge30 (X=Ba, Sr, Eu), and KOs 2O6. The observed Raman peaks have been well assigned by the polarization dependence and the first principles calculation. It has been found that the energy of the guest ion anomalously decreases with decreasing temperature for X8Ga16Ge30, La 3Pd20Ge6, and KOs2O6, where the rattling motion of the guest ion has been reported. However, such anomalous decrease has not been observed in La3Pd20Si 6 (no rattling). The origin of the energy decrease is understood by the existence of the large quartic anharmonic potential. Furthermore, the existence of carriers is important for the rattling mode.

Original languageEnglish
Title of host publicationProceedings ICT'06 - 25th International Conference on Thermoelectrics
Number of pages3
Publication statusPublished - 2006
Externally publishedYes
EventICT'06 - 25th International Conference on Thermoelectrics - Vienna, Austria
Duration: Aug 6 2006Aug 10 2006

Publication series

NameInternational Conference on Thermoelectrics, ICT, Proceedings


OtherICT'06 - 25th International Conference on Thermoelectrics

All Science Journal Classification (ASJC) codes

  • General Engineering


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