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We report the fabrication of (111)-oriented superlattice structures withalternating 2m-layers (m = 1, 2, and 3) of Ca0.5Sr0.5IrO3 perovskite and twolayers of SrTiO3 perovskite on SrTiO3(111) substrates. In the case of m = 1bilayer films, the Ir sub-lattice is a buckled honeycomb, where a topologicalstate may be anticipated. The successful growth of superlattice structures onan atomic level along the [111] direction was clearly demonstrated bysuperlattice reflections in x-ray diffraction patterns and byatomically-resolved transmission electron microscope images. The ground statesof the superlattice films were found to be magnetic insulators, which maysuggest the importance of electron correlations in Ir perovskites in additionto the much discussed topological effects.

Fabrication of (111)-oriented Ca0.5Sr0.5IrO3/SrTiO3 superlattices; a designed playground for honeycomb physics