Transport properties and electronic states of the thermoelectric oxide NaCo_2O_4

Details Transport properties and electronic states of the thermoelectric oxide NaCo_2O_4 Transport properties and electronic states of the thermoelectric oxide NaCo_2O_4

2002-07-12

arxiv.org/abs/cond-mat/0207315v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 Pages, $ figures, Proceedings of The 2nd Hiroshima Workshop: Transport and Thermal Properties of Advanced Materials

Scientific paper

10.1016/S0921-4526(02)01810-0

Physical properties of the thermoelectric oxide NaCo_2O_4 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 Co$^{4+}$ in the low spin state. The large entropy confined in the CoO_2 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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