Probing glasslike excitations in single-crystalline Sr8Ga 16Ge30 by specific heat and thermal conductivity

Kazunori Umeo, Marcos A. Avila, Takeaki Sakata, Kouichirou Suekuni, Toshiro Takabatake

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51 Citations (Scopus)

Abstract

We report the thermal conductivity κ and specific heat C measurements down to 0.3K on single-crystalline samples of n-type Sr8Ga 16Ge30 and p-type Ba8Ga16Ge 30 clathrates. The overall temperature dependence of κ(T) of both samples with a plateau at about 20K and a quadratic T dependence below 1K is well described by the soft-potential model. Using the soft-potential parameter of 4.4K derived from the analysis of κ(T) for Sr 8Ga16Ge30, the broad maximum of C/T3 centered at 7K is also well reproduced. The density of states of quasilocalized vibrational modes for Sr atoms in Sr8Ga16Ge30 has a maximum at 0.7 THz, in agreement with the low-energy peak in a previous Raman scattering study.

Original languageEnglish
Pages (from-to)2145-2148
Number of pages4
Journaljournal of the physical society of japan
Volume74
Issue number8
DOIs
Publication statusPublished - Aug 1 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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