Na-site substitution effects of the thermoelectric properties of NaCo_2O_4

Details Na-site substitution effects of the thermoelectric properties of NaCo_2O_4 Na-site substitution effects of the thermoelectric properties of NaCo_2O_4

1999-07-13

arxiv.org/abs/cond-mat/9907179v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 eps figures, to be published in Phys. Rev. B

Scientific paper

The 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.

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