CHARGE DYNAMICS IN (LA,SR)2CUO4 - FROM UNDERDOPING TO OVERDOPING

The normal state transport properties (resistivity, Hall effect) of La 2-xSrxCuO4 have been studied over wide ranges of Sr doping and tempera ture. The familiar T-linear resistivity and the strongly T dependent H all effect RH(T) are found only near the optimal hole concentration (x almost-equal-to 0.15-0.18). The charge dynamics changes significantly in the non-superconducting overdoped range with RH(T) becoming consta nt above a characteristic temperature T, and rho(T) proportional-to T (n) (n > 1; n almost-equal-to 1.5 +/- 0.1). The temperature scale T+, decreasing with increasing hole concentration, provides a link between transport and magnetic properties.