Unconventional magnetic transition and transport behavior in Na0.75CoO2 -: art. no. 064406

被引：187

作者：

Motohashi, T ^{[1
]}

Ueda, R

Naujalis, E

Tojo, T

Terasaki, I

Atake, T

Karppinen, M

Yamauchi, H

机构：

[1] Tokyo Inst Technol, Mat & Struct Lab, Yokohama, Kanagawa 2268503, Japan

[2] Waseda Univ, Dept Appl Phys, Tokyo 1698555, Japan

来源：

PHYSICAL REVIEW B | 2003年 / 67卷 / 06期

关键词：

D O I：

10.1103/PhysRevB.67.064406

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Here we report an unconventional magnetic and transport phenomenon in a layered cobalt oxide NaxCoO2. Only for x=0.75, a magnetic transition of the second order was clearly detected at T(m)similar to22 K where an apparent specific-heat jump, an onset of extremely small spontaneous magnetization, and a kink in resistivity came in. Moreover large positive magnetoresistance effect was observed below T-m. These features of the transition strongly indicate the appearance of an unusual electronic state that may be attributed to the strongly correlated electrons in Na0.75CoO2.

引用

页数：5

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