Proton incorporations and superconductivity in a cobalt oxyhydrate

Abstract

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.

arXiv comment9 pages, 4 figures

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Cited by in corpus (2)

• Tuning Co valence state in cobalt oxyhydrate superconductor by post reduction
• Upper critical field of aligned Na_{x}(H_{3}O)_{z}CoO_{2}\cdot yH_{2}O superconductor by magnetization measurement