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Ultrasound Studies of Clathrate Thermoelectrics

  • Veerle Keppens (a1), Brian. C. Sales (a2), David Mandrus (a2), Bryan C. Chakoumakos (a2) and Christiane Laermans (a3)...

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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1. See, for example, Sales, B. C. et al., Phys. Rev. B 56, 15081 (1997) and references therein.
2. Nolas, G. S., Cohn, J. L., Slack, G. A., and Schujman, S. B., Appl. Phys. Lett. 73, 178 (1998).
3. Cohn, J. L. et al., Phys. Rev. Lett. 82, 779782 (1999).
4. Chakoumakos, B. C., Sales, B. C., Mandrus, D., and Nolas, G. S., J. Alloys and Compounds, in press.
5. Migliori, A. et al., Physica B 183, 1 (1993).
6. Varshni, P., Phys. Rev. B 2, 3952 (1973).
7. Keppens, V. et al., Nature 395, 876 (1998).
8. Feldman, J., unpublished results.
9. Laermans, C., Keppens, V., and Weeks, R., Phys. Rev. B, 55, 2701 (1997).
10. Anderson, P. W., Halperin, B. I., and Varma, C. M., Phil. Mag. 25, 1 (1972);
Phillips, W. A., J. Low Temp. Phys. 7, 351 (1972).
11. Keppens, V. et al., Phil. Mag. Lett, accepted for publication.

Ultrasound Studies of Clathrate Thermoelectrics

  • Veerle Keppens (a1), Brian. C. Sales (a2), David Mandrus (a2), Bryan C. Chakoumakos (a2) and Christiane Laermans (a3)...

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