Transport properties and electronic states of the thermoelectric oxide NaCo2O4
Abstract
Physical properties of the thermoelectric oxide NaCo2O4 are briefly reviewed. The high thermoelectric properties of this material are attributed to the substantially enhanced effective mass, which comes from the large entropy of Co4+ in the low spin state. The large entropy confined in the CoO2 block causes a spin-density-wave transition at 22 K upon Cu substitution for Co, which can be regarded as ``order from disorder''.
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