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We present the quantitative interpretation for the glass-like behavior ofthermal conductivities $\kappa(T)$ for type-I clathrate compounds involvingoff-centered guest ions. It is shown that the dipole-dipole interactiongenerated in cage/guest-ion systems is crucial to reproduce the characteristicsof thermal conductivities for these symmetry-broken clathrates. The abovescenario also explains well the difference of $\kappa(T)$ between the $p$-typeand the $n$-type $\beta$-BGS found recently by K. Suekuni et al. [Phys. Rev. B,77 (2008) 235119.]

Glass-like Thermal-Transport in Symmetry-Broken Clathrates