Regensburg 2016 – scientific programme

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DS: Fachverband Dünne Schichten

DS 12: Postersession DS

DS 12.6: Poster

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

Twins and Strain in magnetron sputtered epitaxial perovskite oxide films — •Immo Bahns, Patrick Thiessen, Jörg Hoffmann, and Christian Jooß — Uni Göttingen

Because of the large acoustic mismatch multilayers composed of the perovskites SrTiO3 (STO) and Pr0.65Ca0.35MnO3 (PCMO) are interesting model systems for phonon blocking structures. However, the thermal conductivity is significantly affected by strain effects due to the lattice mismatch and preparation-caused defects. In addition, PCMO films are commonly highly twined because of the cubic-to-orthorhombic phase transition. In this contribution we investigate the homoepitaxial growth of STO films on (100) STO substrates and the heteroepitaxial growth of PCMO on STO. The about 200 nm thick films were prepared by magnetron-sputtering of the oxide targets in an argon/oxygen gas mixture. The deposition temperatures were varied between 600 and 800 °C. Phase formation, lattice constants and therefore the strain state are deduced from X-ray inspections. Since PCMO belongs to the class of manganites with a pronounced Colossal Magneto-Resistance effect (CMR) and the CMR is very sensitive with respect to point-like disorder, magnet field dependent resistivity measurements were performed. We also discuss the influence of the deposition parameters on the formation of the 6 twin domains.