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DS: Fachverband Dünne Schichten
DS 24: Thermoelectric Materials
DS 24.8: Talk
Wednesday, March 13, 2013, 16:30–16:45, H32
Acoustic phonon propagation in cobalt antimony skutterudites — •Chuan He1, Martin Großmann1, Martin Schubert1, Marcus Daniel2, Manfred Albrecht2, and Thomas Dekorsy1 — 1University of Konstanz, Germany — 2Chemnitz University of Technology, Germany
Cobalt antimony skutterudites are interesting due to their promising thermoelectric properties. Filling foreign atoms in its cage-like structure is considered beneficial to their thermoelectric properties. The undoped CoSb3 samples and Co4Sb12 samples with different Yb concentration we studied are fabricated using molecular beam epitaxy and characterized by femtosecond pump and probe spectroscopy with an asynchronous optical sampling system. The transient reflectivity signal is strongly dependent on the Yb concentration. For highly doped samples fast electron-phonon coupling is observed.