Structure, magnetic and electrical transport properties of the perovskites Sm1−xCaxFe1−xMnxO3

The structure of series Sm1−xCaxFe1−xMnxO3 (0.0 ≤ x ≤ 1.0) compounds was investigated. The lattice parameters increase with coupled substitution Sm3+ by Ca2+ and Mn4+ for Fe3+. The variation of parameter, c, is larger than that of a and b, respectivly. The detailed analysis of magnetic properties of series Sm1−xCaxFe1−xMnxO3 (0.1 ≤ x ≤ 0.9) shows that local magnetic interaction between Fe3+ and Fe3+ and Mn4+ and Mn4+ at below magnetic transition temperature is antiferromagnetic. Above magnetic transition temperature the presence of large magnetic cluster is proposed and the sizes of magnetic clusters decrease with Mn4+. The electrical transport behaviors related with small polaron hopping and variable range hopping models.