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We prepared a set of polycrystalline samples of the thermoelectric oxide NaCo2−xPdxO4 (x = 0, 0.05, 0.1, and 0.2), and investigated the Pd substitution effects on transport phenomena. The effects are so drastic that just 5–10% Pd ions reduce the resistivity and the Seebeck coefficient to one third of the values for x = 0, and increase the magnitude of the Hall coefficient by three times. A semi-quantitative analysis has revealed that the x = 0.2 sample has much smaller effective mass and carrier concentration than the x = 0.05 sample. This is difficult to explain within a rigid-band picture, and is qualitatively consistent with a strong-correlation picture applied to the Ce-based heavy-fermion systems.

Anomalous Pd substitution effects in the thermoelectric oxide NaCo2 xPdxO4

Anomalous Pd substitution effects in the thermoelectric oxide NaCo_{2 x}Pd_xO₄