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Pb-doping effect on physical properties of misfit-layered (Bi,Pb)-Sr-Co-Osystem, in which Co ions form a two-dimensional triangular lattice, wasinvestigated in detail by electronic transport, magnetization and specific-heatmeasurements. Pb doping enhances the metallic behavior, suggesting thatcarriers are doped. Pb doping also enhances the magnetic correlation in thissystem and increases the magnetic transition temperature. We found theexistence of the short-range magnetic correlation far above the transitiontemperature, which seems to induce the spin-glass state coexisting with theferromagnetic long-range order at low temperatures. Specific-heat measurementsuggests that the effective mass of the carrier in (Bi,Pb)-Sr-Co-O is notenhanced so much as reported in NaCo${}_2$O${}_4$. Based on these experimentalresults, we propose a two-bands model which consists of narrow $a_{1g}$ andrather broad $e'{}_g$ bands. The observed magnetic property andmagnetotransport phenomena are explained well by this model

Physical properties of the misfit-layered (Bi,Pb)-Sr-Co-O system: Effect of hole doping into a triangular lattice formed by low-spin Co ions