Abstract
Different phase transitions are observed in polycrystalline Pr 0.65Ca 0.35− x Sr x MnO 3 ( x = 0–0.35) manganites from the temperature (10–300 K) and magnetic field (0–8 T) dependent resistivity and magnetization data. Replacement of Ca by Sr induces the ferromagnetic metallic (FMM) phase by the melting of the antiferromagnetic/charge ordered insulating (AF/CO-I) phases. The magnetoresistance ratio (MRR) is found to be maximum in samples with coexistent FMM and AF/CO-I phases and minimum in samples with either FMM or AF/CO-I phase. Thermal and magnetic hysteresis of resistivity as well as magnetization can be well explained on the basis of the interplay of charge and spin ordering.
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