Raman scattering of type-I clathrate compounds

Yuichi Takasu, Takumi Hasegawa, Norio Ogita, Masayuki Udagawa, Marcos A. Avila, Koichiro Suekuni, Toshiro Takabatake

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1 Citation (Scopus)

Abstract

Rattling motion of a guest ion in type-I clathrate compounds has been studied by Raman scattering measurements. The anomalous energy-decrease of guest atom vibration has been observed for Sr8Ga16Si 30-xGex and Ba8Ga16Si 30-xGex as well as A8Ga16Ge 30 with decreasing temperature. This result shows that the 4th order anharmonic potential is also important for the guest-ion motion of Sr- and Ba-clathrates. The energy of the guest mode observed by the Raman scattering is consistent with the Einstein temperature estimated by the specific heat measurements. It is confirmed that the off-center rattling plays an important role to suppress the lattice thermal conductivity.

Original languageEnglish
Pages (from-to)254-256
Number of pages3
Journaljournal of the physical society of japan
Volume77
Issue numberSUPPL.A
DOIs
Publication statusPublished - Jan 1 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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  • Cite this

    Takasu, Y., Hasegawa, T., Ogita, N., Udagawa, M., Avila, M. A., Suekuni, K., & Takabatake, T. (2008). Raman scattering of type-I clathrate compounds. journal of the physical society of japan, 77(SUPPL.A), 254-256. https://doi.org/10.1143/JPSJS.77SA.254