Structural phase transition and metallic behavior in misfit layered (Bi,Pb)-Sr-Co-O system

被引：96

作者：

Yamamoto, T

Tsukada, I

Uchinokura, K

Takagi, M

Tsubone, T

Ichihara, M

Kobayashi, K

机构：

[1] Univ Tokyo, Dept Appl Phys, Bunkyo Ku, Bunkyo Ku, Tokyo 1138656, Japan

[2] Univ Tokyo, Dept Adv Mat Sci, Bunkyo Ku, Tokyo 1138656, Japan

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

[4] RIKEN, Inst Phys & Chem Res, Wako, Saitama 3510198, Japan

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS | 2000年 / 39卷 / 7B期

关键词：

layered cobalt oxide; misfit layer structure; structural phase transition; thermoelectric material; carrier doping; ferromagnetic metal;

D O I：

10.1143/JJAP.39.L747

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The crystal structure of Bi2-xPbxSr2Co2Oy has been investigated by X-ray diffraction and electron diffraction analyses. In contrast to what has previously been considered a Bi2Sr2CaCu2O8-type structure, we found that this material has a misfit layer structure: two subcells with different periodicities are alternately stacked. We have studied the x dependence of the crystal structure and found a discontinuous phase transition at x similar or equal to 0.2, where only Bi-Sr-O layers show a drastic change in lattice constants. Pb doping induces metallic behavior, but the effect of the structural phase transition is less clearly observed, which indicates that the electronic properties are mainly dominated by CoO2 layers.

引用

页码：L747 / L750

页数：4

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