Abstract
The reason for the interesting properties observed in CMR materials, other than average ionic radii (〈 r A〉) and Mn valence ratio (Mn 3+/Mn 4+), has been tried to find out by investigating the transport and magnetic properties of Pr 0.65( Ca 0.7 Sr 0.3) 0.35 MnO 3, La 0.123 Pr 0.527( Ca 0.8 Sr 0.2) 0.35 MnO 3 and Pr 0.65(Ca 0.866Ba 0.134) 0.35MnO 3. The 〈 r A〉 and valence ratio of all three samples have been kept equal. The out come of the investigation indicates more intense role of the nature of individual A-site cation and the lattice mismatch.
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