Metal-insulator transition in Ca1-x Nax Ir O3 with post-perovskite structure

K. Ohgushi, H. Gotou, T. Yagi, Y. Kiuchi, F. Sakai, Y. Ueda

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66 Citations (Scopus)


We develop a solid solution Ca1-x Nax Ir O3 (0≤x≤0.37), which exhibits a filling-control metal-insulator transition on a quasi-two-dimensional lattice. The carrier doping into the S=12 antiferromagnetic Mott insulator CaIr O3 destabilizes the magnetic long-range order, culminating in a paramagnetic state at x>0.30, with simultaneous change from insulating to metallic behavior. The temperature (T) dependence of the resistivity for metallic samples (0.31≤x≤0.37) exhibits several characteristic features: (1) a Tα dependence with α∼1.2 in a metallic range, (2) ln T dependence in a weak-localization regime, and (3) positive magnetoresistance violating Kohler's rule. These observations offer a solid foundation to unravel anomalous properties in the normal state of high- Tc cuprates.

Original languageEnglish
Article number241104
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number24
Publication statusPublished - 2006


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