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DS: Fachverband Dünne Schichten

DS 28: Poster: Thin Film Properties: Structure, Morphology and Composition

DS 28.14: Poster

Mittwoch, 18. März 2020, 15:00–18:00, P1A

Ultrathin (SrO)₂ buffer layer actuates strain relaxation in La_0.7Sr_0.3MnO₃/SrTiO₃(100) — •Vitaly Bruchmann-Bamberg¹, Alexandr Belenchuk², Yury Khaydukov^3,4, Vladimir Roddatis⁵, and Vasily Moshnyaga¹ — ¹I. Physik. Inst., G.-A.-Universität Göttingen, Germany — ²IIEN, Academy of Sciences of Moldova, Kishinev, Republic of Moldova — ³Max Planck Institute for Solid State Research, Stuttgart, Germany — ⁴Max Planck Society Outstation at the Heinz Maier-Leibnitz Zentrum, Garching, Germany — ⁵GFZ German Research Centre for Geosciences, Potsdam, Germany

Strain and oxygen octahedral distortions imposed by the substrate play a crucial role in epitaxially grown perovskites, e.g. they strongly affect electrical transport and magnetic properties of the double exchange manganite La_0.7Sr_0.3MnO₃ (LSMO) films. Instead of changing the substrate, a buffer layer can also be used to structurally decouple the film from the substrate. We report on the in-plane strain relaxation of an LSMO film grown on a (SrO)₂ buffered SrTiO₃(100). The buffer layer manifests itself as the Ruddlesden-Popper defect at the interface which disrupts the integrity of the octahedral network imposed by the epitaxy. Strain relaxation as well as the structural decoupling of perovskites through a rock-salt interface, directly visualized by TEM, significantly improves electric and magnetic properties of LSMO (e.g. the Curie and metal-insulator transition temperatures were increased by 30 K). The financial support from DFG via the SFB 1073 (TP A02) and the FRM II at the MLZ Garching are acknowledged.