Berlin 2018 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 28: Complex Oxides: Bulk Properties, Surfaces and Interfaces (joint session TT/MA/KFM)

KFM 28.3: Vortrag

Freitag, 16. März 2018, 10:00–10:15, H 0110

Thermoelectric properties of (SrXO₃)₁(SrTiO₃)_m(001) superlattices, X=V, Mn and Ru — •Manish Verma, Benjamin Geisler, Markus E. Gruner, and Rossitza Pentcheva — Department of Physics and Center for Nanointegration (CENIDE), University of Duisburg-Essen, 47057 Duisburg

The thermoelectric properties of SrTiO₃ have been widely studied, primarily concerning the role of homogeneous bulk doping. However, the confinement realized in oxide superlattices may have a favorable effect on the thermoelectric properties. To this end we have investigated the electronic and thermoelectric properties of superlattices containing a monolayer of SrXO₃ (X=V, Mn and Ru) sandwiched between m=1,3 spacer layer(s) of SrTiO₃ (001) using a combination of density functional theory with an on-site Hubbard term and semi-classical Boltzmann theory. In all cases structural distortions containing octahedral tilts are energetically favored over tetragonal distortions and we explore their influence on the electronic and thermoelectric properties. Comparing the in-plane and out-of-plane transport properties we find no significant dependence on m for the in-plane transport properties. In turn on reduction of the SrTiO₃ thickness from m=3 to 1 enhances the dispersion along Γ-Z and thereby improves the out-of-plane thermoelectric properties. Funded by the DFG, CRC/TRR80 project G8.