MAGNETORESISTANCE IN LA1-XSRXCOO3 FOR LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-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 electro nic properties of the material exhibit a crossover from semiconducting to metallic behavior. The magnetoresistance is highest in the semicon ducting state. A correlation was found between the energy gap determin ed from the de conductivity and the energy scale identified from neutr on scattering data. The results are interpreted in terms of a double-e xchange model.