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.
|ジャーナル||Physical Review B - Condensed Matter and Materials Physics|
|出版ステータス||Published - 2006|
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