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Publication

Einstein Oscillators in Thallium Filled Antimony Skutterudites

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Publication Type
Journal
Journal Name
Physical Review Letters
Publication Date
Volume
90
Issue
13

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±2K , 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±1K . These data provide perhaps the clearest example of local mode behavior in a concentrated metallic system.