Glass-like Thermal-Transport in Symmetry-Broken Clathrates

Details Glass-like Thermal-Transport in Symmetry-Broken Clathrates Glass-like Thermal-Transport in Symmetry-Broken Clathrates

2009-01-19

arxiv.org/abs/0901.2957v2

Europhys. Lett. 86 (2009) 56004

Physics

Condensed Matter

Materials Science

Scientific paper

10.1209/0295-5075/86/56004

We present the quantitative interpretation for the glass-like behavior of thermal conductivities $\kappa(T)$ 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 $\kappa(T)$ between the $p$-type and the $n$-type $\beta$-BGS found recently by K. Suekuni et al. [Phys. Rev. B, 77 (2008) 235119.]

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