We investigated the in-plane anisotropy on the resistivity and thermopower of Bi2-xPbxSr2Co2Oy single crystals, which have a misfit structure between the hexagonal CoO2 layer and the rock salt Bi2Sr2O4 layer. The resistivity and thermopower show significant anisotropy, which exceeds two at maximum. This anisotropy is thought to arise from the anisotropic pseudogap formation enhanced by the misfit structure. The thermopower changes with Pb doping to take a maximum at x = 0.4. The misfit structure improves the thermoelectric properties through chemical pressure. The power factor is as large as 9 μW/cm·K2 at 100 K for x = 0.6, which is the highest value obtained for thermoelectric oxides at 100 K.
|ジャーナル||Japanese Journal of Applied Physics, Part 2: Letters|
|出版ステータス||Published - 2002 7月 1|
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