2002/10/02 by Reiko Kitawaki, R. Kitawaki, Ichiro Terasaki +3
Materials Science · Physics and Astronomy · #Advanced Thermoelectric Materials and Devices #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #cond-mat.str-el
paper · pdf · doi:10.48550/arxiv.cond-mat/0210043
5 pages, 3 figures, RevTeX4
arxiv created 2002/10/02 · arxiv updated 2009/11/30
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 only 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.