Fig. 1.

(A) Seebeck coefficient (S) of LCCO for different concentrations, plotted as $S/T$ versus temperature T, measured at a magnetic field of 11 T for x = 0.11–0.17. T_Smax denotes the temperature below which $S/T$ decreases at low temperatures reaching negative values for x = 0.11 and 0.13. For x = 0.11 and 0.13 $S/T$ decreases below 26.5 and 13 K, respectively. For 0.15, 0.16, and 0.17 $S/T$ shows increasing behavior at low temperature. (B) S versus T for overdoped LCCO, x = 0.19 at zero field. The solid line is the fit to $S\propto T$ down to lowest measuring temperature, 4 K (see text).