The role of doping and dimensionality in the superconductivity of NaxCoO2

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dc.creatorBanobre-Lopez, M.
dc.creatorRivadulla, F.
dc.creatorCaudillo, R.
dc.creatorLopez-Quintela, M. A.
dc.creatorRivas, J.
dc.creatorGoodenough, J. B.
dc.date2004-09-23
dc.date.accessioned2026-07-07T03:00:58Z
dc.date.available2026-07-07T03:00:58Z
dc.descriptionWe report a complete analysis of the formal oxidation state of Co in NaxCoO2, in the interval 0.31<x<0.67. Iodometric titration and thermoelectric power confirm that a direct relationship between the Na content and the amount of Co 3 + cannot be established in this system. Creation of a significant amount of oxygen vacancies accompanies Na-ion deintercalation, keeping the formal Co valence at 3.45 + for x<0.45. To the light of new thermoelectric power data which reveals important differences between the hydrated (superconducting) and non-hydrated (non-superconducting) samples, we propose here that water plays an important chemical role beyond that of a spacer between the CoO2 layers.
dc.descriptionSubmitted to Chemistry of Materials
dc.identifierhttps://arxiv.org/abs/cond-mat/0409606
dc.identifierhttp://arxiv.org/abs/cond-mat/0409606
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/24924
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleThe role of doping and dimensionality in the superconductivity of NaxCoO2
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