Raman scattering of type-I clathrate compounds: A8Ga 16Ge30(A = Eu, Sr, Ba) and Sr8Ga 16Si30-xGex

Y. Takasu, T. Hasegawa, N. Ogita, M. Udagawa, K. Suekuni, M. A. Avila, T. Takabatake

Research output: Contribution to journalArticle

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Abstract

Dynamical motions of a guest ion in type-I clathrate compounds have been studied by Raman scattering measurements. The anomalous temperature dependence of the guest phonon energy has been found not only for A8Ga 16Ge30(A=Ba, Sr, Eu), but also for A8Ga 16Si30-xGex(A = Ba, Sr). It has been found that the 4th order anharmonic potential is important to the guest ion motion. For Sr8Ga16Si30-xGex, the off-center rattling arises with the increase of Ge concentration, and it is confirmed that the off-center rattling plays an important role to the suppression of the lattice thermal conductivity.

Original languageEnglish
Article number012151
JournalJournal of Physics: Conference Series
Volume92
Issue number1
DOIs
Publication statusPublished - Dec 1 2007
Externally publishedYes

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clathrates
Raman spectra
ion motion
thermal conductivity
retarding
temperature dependence
ions
energy

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Raman scattering of type-I clathrate compounds : A8Ga 16Ge30(A = Eu, Sr, Ba) and Sr8Ga 16Si30-xGex. / Takasu, Y.; Hasegawa, T.; Ogita, N.; Udagawa, M.; Suekuni, K.; Avila, M. A.; Takabatake, T.

In: Journal of Physics: Conference Series, Vol. 92, No. 1, 012151, 01.12.2007.

Research output: Contribution to journalArticle

Takasu, Y. ; Hasegawa, T. ; Ogita, N. ; Udagawa, M. ; Suekuni, K. ; Avila, M. A. ; Takabatake, T. / Raman scattering of type-I clathrate compounds : A8Ga 16Ge30(A = Eu, Sr, Ba) and Sr8Ga 16Si30-xGex. In: Journal of Physics: Conference Series. 2007 ; Vol. 92, No. 1.
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AU - Suekuni, K.

AU - Avila, M. A.

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