Superconductivity in a layered cobalt oxyhydrate Na0.31CoO2•1.3H2O

被引：38

作者：

Cao, GH ^{[1
]}

Feng, CM

Xu, Y

Lu, W

Shen, JQ

Fang, MH

Xu, ZA

机构：

[1] Zhejiang Univ, Dept Phys, Hangzhou 310027, Peoples R China

[2] Zhejiang Univ, Test & Anal Ctr, Hangzhou 310027, Peoples R China

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2003年 / 15卷 / 33期

关键词：

D O I：

10.1088/0953-8984/15/33/102

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We report the electrical, magnetic and thermal measurements on a layered cobalt oxyhydrate Na(0.31)CoO(2)(.)1.3H(2)O. Bulk superconductivity at 4.3 K has been confirmed; however, the measured superconducting fraction is relatively low probably due to the sample's intrinsic two-dimensional characteristic. The compound exhibits weak-coupled and extreme type-II superconductivity with an average energy gap Delta(a)(0) and a Ginzburg-Landau parameter kappa of similar to0.50 meV and 140, respectively. The temperature dependence of the normalized electronic specific heat in the superconducting state gives a clue to the superconducting gap structure.

引用

页码：L519 / L525

页数：7