Volume 86, Number 5, June 2009
|Number of page(s)||6|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||19 June 2009|
Glass-like thermal transport in symmetry-broken clathrates
Advanced Photon Source, Argonne National Laboratory - 9700 South Cass Avenue, Argonne, IL 60439, USA
2 Yukawa Institute for Theoretical Physics, Kyoto University - Kyoto 606-8502, Japan
3 Materials Science Division, Argonne National Laboratory - 9700 South Cass Avenue, Argonne, IL 60439, USA
4 Toyota Physical and Chemical Research Institute - Nagakute, Aichi 480-1192, Japan
Corresponding author: email@example.com
Accepted: 20 May 2009
We present the quantitative interpretation for the glass-like behavior of thermal conductivities for type-I clathrate compounds involving off-centered guest ions. It is shown that the dipole-dipole interaction generated in cage/guest-ion systems is crucial to reproduce the characteristics of thermal conductivities for these symmetry-broken clathrates. The above scenario also explains well the difference of between the p-type and the n-type -BGS found recently by K. Suekuni et al. (Phys. Rev. B, 77 (2008) 235119.)
PACS: 61.72.Bb – Theories and models of crystal defects / 66.35.+a – Quantum tunneling of defects / 61.43.-j – Disordered solids
© EPLA, 2009
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