Regensburg 2016 – scientific programme
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DS: Fachverband Dünne Schichten
DS 12: Postersession DS
DS 12.8: Poster
Monday, March 7, 2016, 17:00–19:00, Poster A
Control of octahedral rotations in LaNiO3/LaGaO3 superlattices via octahedral connectivity at heterointerfaces — •Haoyuan Qi1, Michael Kinjanjui1, Xiaodan Chen1, Johannes Biskupek1, Dorin Geiger1, Eva Benckiser2, Hanns-Ulrich Habermeier2, Bernhard Keimer2, and Ute Kaiser1 — 1University of Ulm, Central Facility of Electron Microscopy, Electron Microscopy Group of Materials Science, Albert Einstein Allee 11, D-89081 Ulm, Germany — 2Max Planck Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
For ABO3 perovskites, octahedral rotations and distortions couple strongly to the functional properties. However, precise control of the octahedral rotations in ABO3 heterostructures remains challenging. By using aberration-corrected HRTEM, we investigated the local octahedral rotations in [(4 unit cell (u.c.)//4 u.c.)*8] and [(1 u.c.// 4 u.c.)*13] LaNiO3/LaGaO3 superlattices grown on tensile-strain inducing (001) SrTiO3 substrates. For the [(4 u.c.// 4 u.c.)*8] LaNiO3/LaGaO3 superlattice, the NiO6 octahedral rotations were found to be relaxed to bulk value near the surface of the superlattice indicating that epitaxial strain alone is not enough to stabilize certain octahedral rotational magnitudes throughout the entire superlattice. For the [(1 u.c.// 4 u.c.) *13] LaNiO3/LaGaO3 superlattice, the NiO6 octahedral rotations have the same magnitudes as the neighboring GaO6 octahedra due to interfacial octahedral connectivity. Our study has demonstrated that octahedral rotations in ABO3 heterostructures can be precisely controlled via octahedral connectivity at heterointerfaces.