Novel Charge Ordering in the Trimer Iridium Oxide BaIrO3
Novel Charge Ordering in the Trimer Iridium Oxide BaIrO3
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DOI：
10.3390/cryst6030027
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发表时间：
2016-03
期刊：
影响因子：
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通讯作者：
I. Terasaki;Shunsuke Ito;T. Igarashi;S. Asai;H. Taniguchi;R. Okazaki;Y. Yasui;K. Kobayashi;R. Kumai;H. Nakao;Y. Murakami
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文献类型：
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作者：
I. Terasaki;Shunsuke Ito;T. Igarashi;S. Asai;H. Taniguchi;R. Okazaki;Y. Yasui;K. Kobayashi;R. Kumai;H. Nakao;Y. Murakami
我们已经制备了多晶样品的三聚体铱氧化物BaIrO3与面共享的Ir3O12三聚体，并已调查的起源在182 K的相变，通过测量电阻率，热电势，磁化强度和同步辐射X射线衍射。我们提出了一个可能的电子模型和过渡机制，从一个本地化的电子图片的基础上的Rietveld细化。在该模型中，当Ir3O12三聚体被确定为一个赝原子或一个晶格位置时，BaIrO3基本上可以被视为Mott绝缘体。这种转变可以看作是从Mott绝缘体相到一种电荷有序绝缘体相的转变。
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.