Superconductivity in a layered cobalt oxyhydrate Na0.31CoO2 center dot 1.3H(2)O

作者：Cao GH^*; Feng CM; Xu Y; Lu W; Shen JQ; Fang MH; Xu ZA

来源：Journal of Physics: Condensed Matter , 2003, 15(33): L519-L525.

DOI：10.1088/0953-8984/15/33/102

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.

• 出版日期2003-8-27
• 单位浙江大学