Abstract
We have measured resistivity, magnetization and magnetoresistance in polycrystalline La 0.7− x Pr x Sr 0.3MnO 3 with fixed carrier concentration. With decreasing the average ionic radius of the La site 〈 r A 〉, we found a decrease in T c , an increase in resistivity at T c , and an increase in the magnitude of the magnetoresistance. The samples show a metal-insulator transition in the high-temperature paramagnetic phase with the variation of 〈 r A 〉. These results demonstrate the close relationship between 〈 r A 〉 and the band structure.
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