Regensburg 2016 – scientific programme

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DS: Fachverband Dünne Schichten

DS 12: Postersession DS

DS 12.32: Poster

Monday, March 7, 2016, 17:00–19:00, Poster A

Thermal Characterisation of Ultrathin Complex Oxide Multilayers by the 3ω-Method — •Patrick Thiessen¹, Felix Rieger¹, Vladimir Roddatis¹, Immo Bahns¹, Christian Jooss¹, Oleg Shapoval^2,3, Alexandr Belenchuk^2,3, and Vasily Moshnyaga² — ¹Institut für Materialphysik, Universität Göttingen — ²1. Physikalisches Institut, Universität Göttingen — ³Institute of Applied Physics,Chisinau(Republic of Moldova)

The present work evaluates the thermal conductivity of ultrathin complex oxide superlattices. Three different deposition methods - Metal Aerosol Deposition (MAD), Pulsed Laser Deposition (PLD) and Ion Beam Sputtering (IBS) - were used to epitaxially grow periodic superlattices consistent of La_0.7Sr_0.3MnO₃ (LSMO) and SrTiO₃ (STO) respectively Pr_0.7Ca_0.3MnO₃ (PCMO) and STO on STO(100) substrates with varying individual layer thickness and number of layers. The goal of this work was to investigate the influence of the interfaces in dependence of the superlattice periodicity on the thermal conductivity - i.e. the phonon propagation and scattering. The manganite-STO system serves as a model system for acoustic impedance missnatch (AIM) due to the high difference in its elastic properties and its good epitaxial grow. XRay- and TEM-studies are included in order to distinguish between interface related effects and changes in the lattice strain or in the point defect density.