Metal-insulator transition in Ca1-xNaxIrO3 with post-perovskite structure

被引：59

作者：

Ohgushi, K. ^{[1
]}

Gotou, H. ^{[1
]}

Yagi, T. ^{[1
]}

Kiuchi, Y. ^{[1
]}

Sakai, F. ^{[1
]}

Ueda, Y. ^{[1
]}

机构：

[1] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan

来源：

PHYSICAL REVIEW B | 2006年 / 74卷 / 24期

关键词：

D O I：

10.1103/PhysRevB.74.241104

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We develop a solid solution Ca(1-x)Na(x)IrO(3) (0 <= x <= 0.37), which exhibits a filling-control metal-insulator transition on a quasi-two-dimensional lattice. The carrier doping into the S=1/2 antiferromagnetic Mott insulator CaIrO(3) 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 T(alpha) dependence with alpha similar to 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-T(c) cuprates.

引用

页数：4

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