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Electronic texture of the thermoelectric oxide Na0.75CoO2
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Julien, M. -H., de Vaulx, C., Mayaffre, H., Berthier, C., Horvatic, M., Simonet, V., Wooldridge, J., Balakrishnan, Geetha, Lees, Martin R., Chen, D. P., Lin, C. T. and Lejay, P. (2008) Electronic texture of the thermoelectric oxide Na0.75CoO2. Physical Review Letters, Volume 100 (Number 9). Article no. 096405. doi:10.1103/PhysRevLett.100.096405 ISSN 0031-9007.
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Official URL: http://dx.doi.org/10.1103/PhysRevLett.100.096405
Abstract
From Co-59 and Na-23 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.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics | ||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Library of Congress Subject Headings (LCSH): | Thermoelectricity, Oxides -- Thermal properties, Thermoelectric materials | ||||
| Journal or Publication Title: | Physical Review Letters | ||||
| Publisher: | American Physical Society | ||||
| ISSN: | 0031-9007 | ||||
| Official Date: | 7 March 2008 | ||||
| Dates: |
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| Volume: | Volume 100 | ||||
| Number: | Number 9 | ||||
| Number of Pages: | 4 | ||||
| Page Range: | Article no. 096405 | ||||
| DOI: | 10.1103/PhysRevLett.100.096405 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Funder: | France. Agence nationale de la recherche (ANR), Centre national de la recherche scientifique (France). Institut de Physique de la Matière Condensée |
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