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Related Experiment Videos

Einstein oscillators in thallium filled antimony skutterudites.

Raphaël P Hermann1, Rongying Jin, Werner Schweika

  • 1Department of Physics, B5, University of Liège, B-4000 Sart-Tilman, Belgium.

Physical Review Letters
|April 12, 2003
PubMed
Summary

Thallium (Tl) atoms in filled skutterudites exhibit a localized vibrational mode, observed as a distinct peak in vibrational density of states and heat capacity. This phenomenon provides a clear example of local mode behavior in metallic systems.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid State Chemistry

Background:

  • Skutterudites are a class of compounds with potential thermoelectric properties.
  • Filled skutterudites incorporate guest atoms within their crystal structure, influencing their properties.
  • Understanding the vibrational dynamics of these guest atoms is crucial for optimizing material performance.

Purpose of the Study:

  • To investigate the vibrational properties of thallium (Tl) filled skutterudites.
  • To determine the nature of the vibrational modes associated with Tl atoms.
  • To provide experimental evidence for localized vibrational modes in metallic systems.

Main Methods:

  • Inelastic neutron scattering (INS) measurements were performed on Tl-filled skutterudites (Tl0.5Co3.5Fe0.5Sb12, Tl0.8Co3FeSb12, Tl0.8Co4Sb11Sn) and unfilled CoSb3.

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  • Heat capacity measurements were conducted on Tl0.8Co4Sb11Sn and CoSb3.
  • Data were analyzed using a localized Einstein mode model.

    • Main Results:

    • A sharp peak in the vibrational density of states was observed around 57 K in Tl-filled skutterudites, absent in CoSb3.
    • Heat capacity data confirmed the presence of a localized vibrational mode in Tl0.8Co4Sb11Sn.
    • The localized mode was well-described by a localized Einstein mode model with an Einstein temperature of 53 K.

    Conclusions:

    • The study provides clear evidence of localized vibrational modes due to "rattling" thallium atoms in filled skutterudites.
    • These findings represent a significant example of local mode behavior in concentrated metallic systems.
    • The "rattling" guest atoms significantly influence the vibrational properties of skutterudite compounds.