Electrical Resistivity And Ac Susceptibility Studies In Perovskite Manganites

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Materials based on manganese oxides are generally known as manganites. The manganites RMnO3 (R= Trivalent rare earth elements) and AMnO3 (A= Divalent alkaline earth elements) are known to be insulating with antiferromagnetic (AFM) ordering. Even though the mixed valence manganites, R1-xAxMnO3 (x <= 0.50) are known to exhibit ferromagnetic (FM) to paramagnetic and metal-insulator transitions as early as 1950, the interest in this type of compounds was renewed only after the discovery of large negative magneto-resistivity in the vicinity of the transition temperature (Tc). The Phenomenon of large...

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Supervisor: S. Ravi

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