Off-center rattling modes and glasslike thermal conductivity in the type-I clathrate Ba8Ga16Sn30

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

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Type-I clathrate Ba8Ga16Sn30 is unique for showing glasslike behavior in the lattice thermal conductivity κL irrespective of the charge carrier type. For better understanding the relation between this behavior and guest rattling, polarized Raman-scattering measurements have been performed on carrier-tuned single crystals. The appearance of a symmetry-forbidden mode in the Eg symmetry spectrum indicates that the Ba atoms are rotating among the off-center positions in the tetrakaidecahedron. On cooling from 300 to 4 K, the energies of Eg and T2g guest modes decrease by 15% and 25%, respectively. This drastic decrease originates from the strongly anharmonic potential with a quartic term of the atomic displacement. The energy of 14 cm-1 for the T2g mode at 4 K is the lowest among intermetallic clathrates. These results for Ba8Ga 16Sn30 are compared with those for type-I Eu 8Ga16Ge30 and Sr8Ga 16Ge30 whose κL (T) show similar glasslike behavior with a plateau. The comparison between three systems indicates that the guest rattling energy is proportional to the temperature range of the plateau in κL (T).

Original languageEnglish
Article number205207
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number20
DOIs
Publication statusPublished - May 19 2010
Externally publishedYes

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clathrates
Crystal symmetry
Charge carriers
Crystal lattices
Intermetallics
Raman scattering
Thermal conductivity
thermal conductivity
Single crystals
Cooling
Atoms
plateaus
symmetry
Temperature
intermetallics
energy
charge carriers
Raman spectra
cooling
single crystals

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Off-center rattling modes and glasslike thermal conductivity in the type-I clathrate Ba8Ga16Sn30. / Suekuni, Koichiro; Takasu, Y.; Hasegawa, T.; Ogita, N.; Udagawa, M.; Avila, M. A.; Takabatake, T.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 81, No. 20, 205207, 19.05.2010.

Research output: Contribution to journalArticle

Suekuni, Koichiro ; Takasu, Y. ; Hasegawa, T. ; Ogita, N. ; Udagawa, M. ; Avila, M. A. ; Takabatake, T. / Off-center rattling modes and glasslike thermal conductivity in the type-I clathrate Ba8Ga16Sn30. In: Physical Review B - Condensed Matter and Materials Physics. 2010 ; Vol. 81, No. 20.
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