Thermoelectric power of the Bi₂Sr_2-xCuO_y system

Single-phase Bi₂Sr_2-xCuO_y samples were synthesized by the conventional solid-state reaction method. The normal state transport properties and the behaviour of localized Cu²⁺ spins were investigated by means of resistivity, thermoelectric power and electron paramagnetic resonance. The experimental result shows that with the increase of the fraction of localized Cu²⁺ spins the resistivity increases rapidly and the broad maximum in the TEP curve shifts to high temperature. These results indicate that the variation of resistivity and TEP may be related to localized Cu²⁺ spin scattering.