Na-site substitution effects of the thermoelectric properties of NaCo_2O_4

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dc.creatorKawata, T.
dc.creatorIguchi, Y.
dc.creatorItoh, T.
dc.creatorTakahata, K.
dc.creatorTerasaki, I.
dc.date1999-07-13
dc.date.accessioned2026-07-07T03:13:53Z
dc.date.available2026-07-07T03:13:53Z
dc.descriptionThe resistivity and thermopower of Na$_{1+x}$Co$_2$O$_4$ and Na$_{1.1-x}$Ca$_x$Co$_2$O$_4$ are measured and analyzed. In Na$_{1+x}$Co$_2$O$_4$, whereas the resistivity increases with $x$, the thermopower is nearly independent of $x$. This suggests that the excess Na is unlikely to supply carriers, and decreases effective conduction paths in the sample. In Na$_{1.1-x}$Ca$_x$Co$_2$O$_4$, the resistivity and the thermopower increase with $x$, and the Ca$^{2+}$ substitution for Na$^+$ reduces the majority carriers in NaCo$_2$O$_4$. This means that they are holes, which is consistent with the positive sign of the thermopower. Strong correlation in this compound is evidenced by the peculiar temperature dependence of the resistivity.
dc.description4 pages, 5 eps figures, to be published in Phys. Rev. B
dc.identifierhttps://arxiv.org/abs/cond-mat/9907179
dc.identifierhttp://arxiv.org/abs/cond-mat/9907179
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/29473
dc.subjectStrongly Correlated Electrons
dc.subjectMaterials Science
dc.titleNa-site substitution effects of the thermoelectric properties of NaCo_2O_4
dc.typetext

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