Large in-plane anisotropy on resistivity and thermopower in the misfit layered oxide Bi2-xPbxSr2Co2Oy

被引：54

作者：

Fujii, T ^{[1
]}

Terasaki, I

Watanabe, T

Matsuda, A

机构：

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

[2] Japan Sci & Technol Corp, Kawaguchi 3320012, Japan

[3] NTT Photon Labs, Atsugi, Kanagawa 2430198, Japan

[4] NTT Basic Res Labs, Atsugi, Kanagawa 2430198, Japan

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS | 2002年 / 41卷 / 7A期

关键词：

layered cobalt oxide; in-plane anisotropy; in-plane resistivity; thermopower; misfit structure;

D O I：

10.1143/JJAP.41.L783

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We investigated the in-plane anisotropy on the resistivity and thermopower of Bi2-xPbxSr2Co2Oy single crystals, which have a misfit structure between the hexagonal CoO2 layer and the rock salt Bi2Sr2O4 layer. The resistivity and thermopower show significant anisotropy, which exceeds two at maximum. This anisotropy is thought to arise from the anisotropic pseudogap formation enhanced by the misfit structure. The thermopower changes with Pb doping to take a maximum at x = 0.4. The misfit structure improves the thermoelectric properties through chemical pressure. The power factor is as large as 9 muW/cm(.)K(2) at 100 K for x = 0.6, which is the highest value obtained for thermoelectric oxides at 100 K.

引用

页码：L783 / L786

页数：4

共 17 条

[1] Electrical resistivity Anisotropy from self-organized one dimensionality in high-temperature superconductors [J].