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Dynamics of coherent acoustic phonons in thin films of CoSb<sub>3</sub> and partially filled Yb<sub>x</sub>Co<sub>4</sub>Sb<sub>12</sub> skutterudites

Dynamics of coherent acoustic phonons in thin films of CoSb3 and partially filled YbxCo4Sb12 skutterudites

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HE, Chuan, Marcus DANIEL, Martin GROSSMANN, Oliver RISTOW, Delia BRICK, Martin SCHUBERT, Manfred ALBRECHT, Thomas DEKORSY, 2014. Dynamics of coherent acoustic phonons in thin films of CoSb3 and partially filled YbxCo4Sb12 skutterudites. In: Physical Review B. 89(17). ISSN 1098-0121. eISSN 1550-235X. Available under: doi: 10.1103/PhysRevB.89.174303

@article{He2014Dynam-28159, title={Dynamics of coherent acoustic phonons in thin films of CoSb3 and partially filled YbxCo4Sb12 skutterudites}, year={2014}, doi={10.1103/PhysRevB.89.174303}, number={17}, volume={89}, issn={1098-0121}, journal={Physical Review B}, author={He, Chuan and Daniel, Marcus and Grossmann, Martin and Ristow, Oliver and Brick, Delia and Schubert, Martin and Albrecht, Manfred and Dekorsy, Thomas} }

2014 He, Chuan terms-of-use Schubert, Martin Dekorsy, Thomas Albrecht, Manfred 2014-07-22T13:59:51Z eng Daniel, Marcus Grossmann, Martin Grossmann, Martin Daniel, Marcus 2014-07-22T13:59:51Z Physical Review / B ; 89 (2014). - 174303 Dekorsy, Thomas Brick, Delia Dynamics of coherent acoustic phonons in thin films of CoSb<sub>3</sub> and partially filled Yb<sub>x</sub>Co<sub>4</sub>Sb<sub>12</sub> skutterudites Ristow, Oliver Schubert, Martin Ristow, Oliver Brick, Delia Albrecht, Manfred He, Chuan Skutterudites are considered as interesting material for thermoelectric applications. Filling foreign atoms into the cagelike structure of a CoSb<sub>3</sub> skutterudite is beneficial to its thermoelectric properties by increasing phonon scattering while maintaining the electrical conductivity. In this paper we demonstrate the generation and detection of coherent acoustic phonons in thin films of CoSb<sub>3</sub> and partially filled Yb<sub>x</sub>Co<sub>4</sub>Sb<sub>12</sub> skutterudites using femtosecond pump-probe spectroscopy. By using a pulse-echo method, the longitudinal sound velocity of amorphous and polycrystalline CoSb<sub>3</sub> thin films is obtained. For partially filled Yb<sub>x</sub>Co<sub>4</sub>Sb<sub>12</sub> thin films, an obvious decrease of the longitudinal sound velocity is observed at high filling fraction. Concomitantly, the high frequency acoustic phonon modes are strongly damped as the Yb filling fraction increases, which gives direct evidence for acoustic phonon scattering processes. It is shown that the reduction of lattice thermal conductivity after Yb filling is mainly achieved by the strong scattering of acoustic phonons.

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