Transport properties of the thermoelectric layered cobalt oxide Pb–Sr–Co–O single crystals

The authors have synthesized single-crystal samples of the layered cobalt oxide Pb–Sr–Co–O and measured resistivity, thermopower, and Hall coefficient from 4.2to300K. The resistivity, the thermopower, and the Hall coefficient are 13mΩcm, 150μV∕K, and 1.6×10−2cm3∕C at 300K, respectively, which are typical values for a misfit-layered cobalt oxide. The thermopower and resistivity are associated with spin density wave, and a close relationship between the pseudogap temperature and the thermopower is suggested for all the misfit-layered cobalt oxides.