Large Thermopower in a Layered Oxide NaCo_2O_4

Details Large Thermopower in a Layered Oxide NaCo_2O_4 Large Thermopower in a Layered Oxide NaCo_2O_4

1999-03-10

arxiv.org/abs/cond-mat/9903162v1

Proc. of 17th International Conference on Thermoelectrics (1998) p.567

Physics

Condensed Matter

Materials Science

3 pages (LaTeX), 4 EPS figures

Scientific paper

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.

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