Large In-Plane Anisotropy on Resistivity and Thermopower in the Misfit Layered Oxide Bi2-xPbxSr2Co2Oy
- 1 July 2002
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 41 (Part 2, No) , L783-L786
- https://doi.org/10.1143/jjap.41.l783
Abstract
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/cmK2 at 100 K for x=0.6, which is the highest value obtained for thermoelectric oxides at 100 K.Keywords
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