Magnetoresistance in La1-xSrxCoO3 for 0.05<=x<=0.25

The de resistivity, magnetoresistance, and magnetic susceptibility of La1-xSrxCoO3 compounds have been investigated in the temperature range of 4-300 K for magnetic fields up to 7 T. In the doping range studied (0.05 less than or equal to x less than or equal to 0.25) the electronic properties of the material exhibit a crossover from semiconducting to metallic behavior. The magnetoresistance is highest in the semiconducting state. A correlation was found between the energy gap determined from the de conductivity and the energy scale identified from neutron scattering data. The results are interpreted in terms of a double-exchange model.