Large Thermopower in a Layered Oxide NaCo_2O_4
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A transition-metal oxide NaCo_2O_4 is a layered oxide in which CoO_2 and Na alternately stack along the c axis. Recently we have found that this compound shows unusually large thermopower with low resistivity, which is comparable to those of Bi_2Te_3. The negative transverse magnetoresistance and the strongly temperature-dependent Hall coefficient suggest that electron correlation dominates the conduction mechanism in NaCo_2O_4.
3 pages (LaTeX), 4 EPS figures
3 pages (LaTeX), 4 EPS figures