Charge ordering in charge-compensated $N{a}_{0.41}Co{O}_2$ by oxonium ions

Abstract

Charge ordering behavior is observed in the crystal prepared through the immersion of the $N{a}_{0.41}Co{O}_2$ crystal in distilled water. Discovery of the charge ordering in the crystal with Na content less than 0.5 indicates that the immersion in water brings about the reduction of the $N{a}_{0.41}Co{O}_2$. The formal valence of Co changes from +3.59 estimated from the Na content to +3.5, the same as that in $N{a}_{0.5}Co{O}_2$. The charge compensation is confirmed to arise from the intercalation of the oxonium ions as occurred in the superconducting sodium cobalt oxide bilayer-hydrate.\cite{takada1} The charge ordering is the same as that observed in $N{a}_{0.5}Co{O}_2$. It suggests that the Co valence of +3.5 is necessary for the charge ordering.

5 pages, 4 figures

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Cited by in corpus (1)

• Anisotropic Magnetoresistance in Charge-Ordering $N{a}_{0.34}(H_{3}O{)}_{0.15}Co{O}_2$:Strong Spin-Charge Coupling and Spin Ordering