Preparation and transport properties of non-hydrated Na$_{0.5}$CoO$_2$ single crystals

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dc.creatorChen, X. Z.
dc.creatorXu, Z. A.
dc.creatorCao, G. H.
dc.creatorShen, J. Q.
dc.creatorQiu, L. M.
dc.creatorGan, Z. H.
dc.date2004-12-12
dc.date.accessioned2026-07-07T03:02:38Z
dc.date.available2026-07-07T03:02:38Z
dc.descriptionSingle crystals of Na$_{0.5}$CoO$_2$ were obtained through a flux method followed by de-intercalation of sodium. The Na$_{0.5}$CoO$_2$ samples were found to be vulnerable to water in the air and a hydration process in which H$_2$O molecules fill oxygen vacancies in CoO$_2$ layers is suggested to be responsible for the unusual vulnerability to water. The transport properties, including resistivity (\emph{$ρ$}), thermopower (\emph{S}) and Hall coefficient (\emph{R$_H$}), were studied in a temperature range of 5-300 K. The compound shows a weak localization of carriers just below 200 K and Co$^{3+}$-Co$^{4+}$ charge ordering at about 30 K, a relatively lower temperature than previously reported. The results seem to be quite different from those previously reported for this system [Foo et al, Phys. Rev. Lett. 92 (2004) 247001]. Possible mechanism underlying this kind of inconsistency is discussed.
dc.description9 pages, 5 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0412299
dc.identifierhttp://arxiv.org/abs/cond-mat/0412299
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/25464
dc.subjectStrongly Correlated Electrons
dc.subjectMaterials Science
dc.titlePreparation and transport properties of non-hydrated Na$_{0.5}$CoO$_2$ single crystals
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