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We investigated the in-plane anisotropy on the resistivity and thermopower ofBi2-xPbxSr2Co2Oy single crystals, which have a misfit structure between thehexagonal CoO2 layer and the rock salt Bi2Sr2O4 layer. The resistivity andthermopower show significantly large anisotropy, which exceeds two at maximum.This anisotropy would come from the anisotropic pseudogap formation enhanced bythe misfit structure. The thermopower changes with Pb doping to take a maximumat x=0.4. The misfit structure improves the thermoelectric properties throughchemical pressure. The power factor is as large as 9 muW/cmK2 at 100 K forx=0.6, which is the highest value for thermoelectric oxides at 100 K.Comment: 4 pages, 3 figures, submitted to Jpn. J. Appl. Phy

Large In-Plane Anisotropy on Resistivity and Thermopower in the Misfit Layered Oxide Bi2-xPbxSr2Co2Oy