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We report the fabrication of (111)-oriented superlattice structures with alternating 2-layers ( = 1, 2, and 3) of CaSrIrO perovskite and two layers of SrTiO perovskite on SrTiO(111) substrates. In the case of = 1 bilayer films, the Ir sub-lattice is a buckled honeycomb, where a topological state may be anticipated. The successful growth of superlattice structures on an atomic level along the [111] direction was clearly demonstrated by superlattice reflections in x-ray diffraction patterns and by atomically resolved transmission electron microscope images. The ground states of the superlattice films were found to be magnetic insulators, which may suggest the importance of electron correlations in Ir perovskites in addition to the much discussed topological effects.


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