Inelastic neutron scattering measurements on several Tl filled skutterudites (Tl0.5Co3.5Fe0.5Sb₁₂, Tl0.8Co₃FeSb₁₂, and Tl0.8Co₄Sb₁₁Sn) all show a sharp peak in the vibrational density of states at 57±2 K, which is absent in the unfilled skutterudite CoSb₃. Heat capacity measurements on Tl0.8Co₄Sb₁₁Sn as compared to CoSb₃ are consistent with the presence of a localized vibrational mode associated with the ``rattling'' thallium atoms in this filled skutterudite compound. Both results are well described by a localized Einstein mode model with an Einstein temperature ΘE of 53±1 K. These data provide perhaps the clearest example of local mode behavior in a concentrated metallic system.
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Hermann et al. (2003) studied this question.
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