Abstract
Abstract Structural, electrical and magnetic measurements on half-doped (LaR)0.5(CaSr)0.5MnO3 (R=Nd, Eu and Tb) samples have been carried out to study the effect of average A-site cation radius (〈rA〉) and size mismatch on charge-ordering and magnetic properties. The Eu-doped composition has the smallest (〈rA〉) and shows coexistence of charge ordering and ferromagnetism, which points towards phase separation. The Tb- and Nd-doped samples do not exhibit charge ordering, and ferromagnetic-metallic behavior of these samples may be attributed to the effect of large 〈rA〉 and large size mismatch at the A-site.
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