SCALING OF THE THERMOELECTRIC-POWER IN THE LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-0.7) AND TL2BA2CA1-XYXCU2O8+Y LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-0.6) SYSTEMS(Y (0)

The temperature-dependent thermoelectric power S of insulating and met allic Bi-2212 and Tl-2212 samples are scaled to universal master curve s. For insulating samples, S passes through a peak at a characteristic temperature T-S, which decreases with increasing carrier concentrati on. For metallic samples a scaling parameter alpha (= dS/dT at high te mperatures) decreases with increasing carrier density. It is argued th at T-S is related to the energy needed for activation conduction wher eas the change in a may be due to increase in n/m with carrier densit y, where n is the concentration and m is the effective mass of the ca rriers.