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Title: Fabrication of (111)-oriented Ca{sub 0.5}Sr{sub 0.5}IrO{sub 3}/SrTiO{sub 3} superlattices—A designed playground for honeycomb physics

We report the fabrication of (111)-oriented superlattice structures with alternating 2m-layers (m = 1, 2, and 3) of Ca{sub 0.5}Sr{sub 0.5}IrO{sub 3} perovskite and two layers of SrTiO{sub 3} perovskite on SrTiO{sub 3}(111) substrates. In the case of m = 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.
Authors:
 [1] ;  [2] ;  [1] ;  [3]
  1. Department of Physics, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033 (Japan)
  2. RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198 (Japan)
  3. (Germany)
Publication Date:
OSTI Identifier:
22415272
Resource Type:
Journal Article
Resource Relation:
Journal Name: APL materials; Journal Volume: 3; Journal Issue: 4; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CALCIUM COMPOUNDS; CUBIC LATTICES; ELECTRON CORRELATION; FABRICATION; FILMS; GROUND STATES; INTERFACES; IRIDIUM OXIDES; LAYERS; PEROVSKITE; REFLECTION; STRONTIUM TITANATES; SUBSTRATES; SUPERLATTICES; TOPOLOGY; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION