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Ultrasound Studies of Clathrate Thermoelectrics

Published online by Cambridge University Press:  01 February 2011

Veerle Keppens ,
Brian. C. Sales ,
David Mandrus ,
Bryan C. Chakoumakos  and
Christiane Laermans
Veerle Keppens
Affiliation:
National Center for Physical Acoustics, University of Mississippi, Oxford, MS 38677, U.S.A.
Brian. C. Sales
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831–6056, U.S.A.
David Mandrus
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831–6056, U.S.A.
Bryan C. Chakoumakos
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831–6056, U.S.A.
Christiane Laermans
Affiliation:
Dept. of Physics, Katholieke Universiteit Leuven, B-3001 Leuven, Belgium.
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Abstract

Resonant Ultrasound Spectroscopy and low-temperature ultrasonic attenuation measurements are reported for filled and unfilled skutterudites and for Ge-clathrates. These data reveal that an unusual elastic behavior complements the thermal properties of the filled skutterudites and indicate the presence of low-energy vibrational modes. The attenuation at low-temperatures in the single-crystalline Ge-clathrate is glasslike and can be described by the same phenomenological Tunneling Model that has been developed to describe the low-temperature properties of amorphous solids.

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References

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