Electronic texture of the thermoelectric oxide Na0.75CoO2

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dc.creatorJulien, M. -H.
dc.creatorde Vaulx, C.
dc.creatorMayaffre, H.
dc.creatorBerthier, C.
dc.creatorHorvatic, M.
dc.creatorSimonet, V.
dc.creatorWooldridge, J.
dc.creatorBalakrishnan, G.
dc.creatorLees, M. R.
dc.creatorChen, D. P.
dc.creatorLin, C. T.
dc.creatorLejay, P.
dc.date2008-01-26
dc.date.accessioned2026-07-07T09:24:44Z
dc.date.available2026-07-07T09:24:44Z
dc.descriptionFrom 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.
dc.description4 pages, to appear in Phys. Rev. Lett
dc.identifierhttps://arxiv.org/abs/0801.4095
dc.identifierhttp://arxiv.org/abs/0801.4095
dc.identifierPhys. Rev. Lett. 100, 096405 (2008)
dc.identifierdoi:10.1103/PhysRevLett.100.096405
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/156172
dc.subjectStrongly Correlated Electrons
dc.titleElectronic texture of the thermoelectric oxide Na0.75CoO2
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