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Crystals 2016, 6(3), 27;

Novel Charge Ordering in the Trimer Iridium Oxide BaIrO3

Department of Physics, Nagoya University, Nagoya 464-8602, Japan
Department of Physics, Faculty of Science and Technology, Tokyo University of Science, Noda 278-8510, Japan
Department of Physics, Meiji University, Kawasaki 214-8571, Japan
Condensed Matter Research Center and Photon Factory, High Energy Accelerator Research Organization, Tsukuba 305-0801, Japan
Author to whom correspondence should be addressed.
Academic Editor: Helmut Cölfen
Received: 21 December 2015 / Revised: 10 March 2016 / Accepted: 11 March 2016 / Published: 16 March 2016
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We have prepared polycrystalline samples of the trimer Ir oxide BaIrO3 with face-shared Ir3O12 trimers, and have investigated the origin of the phase transition at 182 K by measuring resistivity, thermopower, magnetization and synchrotron X-ray diffraction. We propose a possible electronic model and transition mechanism, starting from a localized electron picture on the basis of the Rietveld refinement. Within this model, BaIrO3 can be basically regarded as a Mott insulator, when the Ir3O12 trimer is identified to one pseudo-atom or one lattice site. The transition can be viewed as a transition from the Mott insulator phase to a kind of charge ordered insulator phase. View Full-Text
Keywords: face-sharing; Iridium oxide; charge order; structure-property relation face-sharing; Iridium oxide; charge order; structure-property relation

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Terasaki, I.; Ito, S.; Igarashi, T.; Asai, S.; Taniguchi, H.; Okazaki, R.; Yasui, Y.; Kobayashi, K.; Kumai, R.; Nakao, H.; Murakami, Y. Novel Charge Ordering in the Trimer Iridium Oxide BaIrO3. Crystals 2016, 6, 27.

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