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Crystals 2016, 6(3), 27; doi:10.3390/cryst6030027

Novel Charge Ordering in the Trimer Iridium Oxide BaIrO3

1
Department of Physics, Nagoya University, Nagoya 464-8602, Japan
2
Department of Physics, Faculty of Science and Technology, Tokyo University of Science, Noda 278-8510, Japan
3
Department of Physics, Meiji University, Kawasaki 214-8571, Japan
4
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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Abstract

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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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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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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