Electronic texture of the thermoelectric oxide Na0.75CoO2

Details Electronic texture of the thermoelectric oxide Na0.75CoO2 Electronic texture of the thermoelectric oxide Na0.75CoO2

2008-01-26

arxiv.org/abs/0801.4095v1

Phys. Rev. Lett. 100, 096405 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.100.096405

From 59Co and 23Na NMR, we demonstrate the impact of the Na+ vacancy ordering on the cobalt electronic states in Na0.75CoO2: at long time scales, there is neither a disproportionation into 75 % Co3+ and 25 % Co4+ states, nor a mixed-valence metal with a uniform Co3.25+ state. Instead, the system adopts an intermediate configuration in which 30 % of the lattice sites form an ordered pattern of localized Co3+ states. Above 180 K, an anomalous mobility of specific Na+ sites is found to coexist with this electronic texture, suggesting that the formation of the latter may contribute to stabilizing the Na+ ordering. Control of the ion doping in these materials thus appears to be crucial for fine-tuning of their thermoelectric properties.

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