Proton incorporations and superconductivity in a cobalt oxyhydrate

Details Proton incorporations and superconductivity in a cobalt oxyhydrate Proton incorporations and superconductivity in a cobalt oxyhydrate

2004-02-26

arxiv.org/abs/cond-mat/0402638v1

Solid State Communications 131/2, 125-128 (2004).

Physics

Condensed Matter

Superconductivity

9 pages, 4 figures

Scientific paper

10.1016/j.ssc.2004.04.034

We report the evidence of proton incorporations in a newly-discovered cobalt oxyhydrate superconductor. During the hydration process for Na$_{0.32}$CoO$_{2}$ by the direct reaction with water liquid, it was shown that substantial NaOH was gradually liberated, indicating that H$^{+}$ is incorporated into the hydrated compound. Combined with the thermogravimetric analysis, the chemical composition of the typical sample is Na$_{0.22}$H$_{0.1}$CoO$_{2}\cdot 0.85$H$_{2}$O, which shows bulk superconductivity at 4.4 K.

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