Electronic texture of the thermoelectric oxide Na0.75CoO2
| Autor: | Julien, M. -H., de Vaulx, C., Mayaffre, H., Berthier, C., Horvatic, M., Simonet, V., Wooldridge, J., Balakrishnan, G., Lees, M. R., Chen, D. P., Lin, C. T., Lejay, P. |
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| Rok vydání: | 2008 |
| Předmět: | |
| Zdroj: | Phys. Rev. Lett. 100, 096405 (2008) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.100.096405 |
| Popis: | 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. Comment: 4 pages, to appear in Phys. Rev. Lett |
| Databáze: | arXiv |
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