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

研究成果: 書籍/レポート タイプへの寄稿会議への寄与

1 被引用数 (Scopus)

抄録

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.

本文言語英語
ホスト出版物のタイトルProceedings ICT'06 - 25th International Conference on Thermoelectrics
ページ33-35
ページ数3
DOI
出版ステータス出版済み - 2006
外部発表はい
イベントICT'06 - 25th International Conference on Thermoelectrics - Vienna, オーストリア
継続期間: 8月 6 20068月 10 2006

出版物シリーズ

名前International Conference on Thermoelectrics, ICT, Proceedings

その他

その他ICT'06 - 25th International Conference on Thermoelectrics
国/地域オーストリア
CityVienna
Period8/6/068/10/06

!!!All Science Journal Classification (ASJC) codes

  • 工学(全般)

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