Electronic Texture of the Thermoelectric Oxide Na_(0.75)CoO_2

摘要

From ~(59)Co and ~(23)Na NMR, we demonstrate the impact of the Na~+ vacancy ordering on the cobalt electronic states in Na_(0.75)CoO_2: at long time scales, there is neither a disproportionation into 75% Co~(3+) and 25% Co~(4+) states, nor a mixed-valence