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MM: Fachverband Metall- und Materialphysik
MM 18: Poster Session I
MM 18.42: Poster
Montag, 16. März 2020, 18:15–20:00, P4
Thermal conduction in epitaxial LaMnO3/SrMnO3 superlattices — •Daniel Metternich1, Dennis Meyer1, Roland Potthast1, Jan-Phillip Bange1, Marius Keunecke1, Robert Gruhl1, Vladimir Roddatis2, Vasily Moshnyaga1, and Henning Ulrichs1 — 1I. Physikalisches Institut, Georg-August Universität Göttingen, Germany — 2Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum
We report on experimental and theoretical investigations of the thermal conduction in LaMnO3 (LMO) / SrMnO3 (SMO) epitaxial superlattice structures, grown by metal-organic aerosol deposition (MAD).
The thermal conductivity of our samples is measured with a transient thermoreflectivity setup - a method that uses a pulsed laser to heat the sample whilst a continuous wave laser measures the surface reflectivity (TTR), and thereby the surface temperature in the time domain. A comparison between samples of different periodicities and LMO/SMO-ratios in particular reveals an unexpected behaviour of the contribution of LMO to the thermal conduction: In single LMO films we find a thermal conductivity close to the amorphous limit, whereas when integrating the LMO into a superlattice, its contribution to the conductivity strongly increases. We relate this finding to a structural modification of the LMO layers in the superlattice.
In addition, we compare our findings with theoretical first-principles calculations regarding the structural configuration of the multi-layered system as well as the phononic contributions to the heat transfer. We acknowledge financial support by the DFG within SFB 1073.