Regensburg 2019 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 20: Poster session II

MM 20.32: Poster

Dienstag, 2. April 2019, 18:30–20:00, Poster C

Thermal conduction in epitaxial LaMnO3/SrMnO3 superlattices — •Daniel Metternich¹, Dennis Meyer¹, Roland Potthast¹, Jan-Phillip Bange¹, Marius Keunecke¹, Vladimir Roddatis², Vasily Moshnyaga¹, and Henning Ulrichs¹ — ¹I. Physikalisches Institut, Georg-August Universität Göttingen, Germany — ²Institut für Materialphysik, Georg-August Universität Göttingen, Germany

We report on our experimental investigations of the thermal conduction in LaMmO₃ (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. We show that TTR is optimally suited for our oxide samples, which feature rather slow thermal dynamics. We elucidate the influence of different periodicities and arrangements of the layers of the superlattice. Furthermore, the thermal conductivity of the superlattice structures are compared to homogeneous LSMO, LMO, and SMO films. This in particular enables us to study the effect of the interfaces between LMO and SMO. Given the high structural quality of our superlattice, we also briefly discuss our plans to compare our findings with theoretical modelling and ultimately with first-principles calculations of phonon band structures. We acknowlegde financial support by the DFG within SFB1073.