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MM: Fachverband Metall- und Materialphysik
MM 46: Materials for Energy Storage and Conversion - Electronic Properties
MM 46.5: Vortrag
Mittwoch, 18. März 2020, 18:15–18:30, IFW D
Lattice dynamics in PbTe under high pressure — •Zehua Li1, Shasha Li2, Rolf Heid1, John-paul Castellan3, Stefan Klotz4, Alexandre Ivanov5, Yue Chen2, and Frank Weber1 — 1Karlsruhe Institute of Technology, Institute for Solid State Physics, 76021 Karlsruhe, Germany — 2Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, China. — 3Laboratoire Léon Brillouin (CEA-CNRS), CEA-Saclay, F-91911 Gif-sur-Yvette, France — 4Sorbonne Université, UMR 7590, IMPMC, F-75252 Paris, France — 5Institut Laue-Langevin, 71 avenue des Martyrs, 38000 Grenoble, France
Thermoelectric materials such as PbTe are interesting for energy applications as they can transform heat into useful electricity. Understanding the impact of anharmonicity in the lattice dynamical properties is the key to engineer/design new high-performance thermoelectric materials requiring a low lattice contribution to the thermal conductivity. Here, we report an investigation on zone center transverse optic phonons in PbTe at pressures up to 5.3 GPa by inelastic neutron scattering. We observe a non-monotonic pressure dependence in the phonon energy as well as a clearly reduced phonon linewidth at high pressures.