GIANT MAGNETOTRANSPORT PHENOMENA IN FILLING-CONTROLLED KONDO-LATTICE SYSTEM - LA1-XSRXMNO3

Giant magnetotransport phenomena including the field-induced nonmetal-metal transition have been found in single crystals of La1-xSrxMnO3 near the critical composition (x approximate to 0.17) for the nonmetal-metal transition and in the temperature region around the magnetic phase transition. Change of the resistivity shows a universal curve as a function of the magnitude of temperature- or field-induced magnetization, the most of which agrees with the prediction by the D=infinity and S=infinity Kondo lattice model with strong ferromagnetic (Hund) coupling.