Superconductivity in a layered cobalt oxyhydrate Na${}_{0.31}$CoO${}_2\cdot$1.3H${}_2$O

Abstract

We report the electrical, magnetic and thermal measurements on a layered cobalt oxyhydrate Na${}_{0.31}$CoO${}_2\cdot$1.3H${}_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 the average energy gap ${\Delta }_a(0)$ and the Ginzburg-Landau parameter $\kappa$ of $\sim$ 0.50 meV and $\sim$ 140, respectively. The normalized electronic specific heat data in the superconducting state well fit the $T^3$ dependence, suggesting point nodes for the superconducting gap structure.

arXiv comment4 pages, 3 figures

References in corpus (2)

• Specific-heat evidence for strong electron correlations in the thermoelectric material (Na,Ca)Co_{2}O_{4}
• Chemical Instability of the Cobalt Oxyhydrate Superconductor under Ambient Conditions

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