Abstract
We report transport, magnetization and transmission electron microscopy studiesof the effects of A-and B-site substitution, and the addition of metal ions such asPt, Ag and Sr, on doped ABO3 perovskites, where A = La, Pr etc and B = Mn. Disorder induced by such substitution changes the behaviour ofthe charge-ordered (CO) state significantly. A-and B-site substitutionsuppresses the CO phase due to size mismatch and disorder produced byinhomogeneity. On the other hand, addition of metal ions such as Pt and Agimproves several colossal-magnetoresistance properties significantly due tomicrostructural effects and enhanced current percolation through grainboundaries.
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