Abstract
The study of the samarium manganites Sm 1−x(Sr,Ca) xMnO 3 has shown the magnetoresistance properties of this kind of compounds. It allowed us to evidence the effect of the two antagonist effects, interpolated cation size and Mn(IV) : Mn(III) ratio, on the transition temperature T max. By varying these two factors, we were able to get RR ratio of 10 5 at 75K under 5T for Sm 0.58Sr 0.3Ca 0.12MnO 3. From this study, we have evidenced that the Sm 0.5Sr 0.5MnO 3 compound exhibits CMR properties corresponding to a transition from a ferromagnetic metallic state to a paramagnetic semi-conducting state as T increases, contrary to that observed for Pr 0.5Sr 0.5MnO 3 and Nd 0.5Sr 0.5MnO 3.
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