Transport properties and electronic states of the thermoelectric oxide NaCo_2O_4

Abstract

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''.

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

References in corpus (3)

• Coherence-Incoherence and Dimensional Crossover in Layered Strongly Correlated Metals
• Impurity-induced transition and impurity-enhanced thermopower in the thermoelectric oxide NaCo_{2-x}Cu_x$O_4
• Ferromagnetism and large negative magnetoresistance in Pb doped Bi-Sr-Co-O misfit-layer compound

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• Single-hole properties of the t-J model on the honeycomb lattice
• Drastic ground state changes induced by Ni substitution in NaxCoO2
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