This title appears in the Scientific Report : 2003 

Einstein oscillators in thallium filled antimony skutterudites
Hermann, R. P.
Jin, R. / Schweika, W. / Grandjean, W. B. / Mandrus, D. / Sales, B. C. / Long, St. P.
Streumethoden; IFF-STM
Physical review letters, 90 (2003) S. 135505-1 - 135505-4
College Park, Md. APS 2003
135505-1 - 135505-4
10.1103/PhysRevLett.90.135505
Journal Article
Kondensierte Materie
Physical Review Letters 90
J
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Please use the identifier: http://dx.doi.org/10.1103/PhysRevLett.90.135505 in citations.
Please use the identifier: http://hdl.handle.net/2128/1316 in citations.
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 Theta(E) of 53 +/- 1 K. These data provide perhaps the clearest example of local mode behavior in a concentrated metallic system.