Magnetic and transport properties in Sr1−xLaxFe1−xMnxO3

The magnetic and transport properties in the perovskite Sr1−xLaxFe1−xMnxO3 have been explored. As x rises, the systemic ferromagnetism increases gradually and cluster-spin-glass state occurs in the low-temperature region. For 0.3⩽x⩽0.7, the ferromagnetic phase separation from the paramagnetic phase was observed from the results of electron-spin-resonance measurement. Although all samples show a semiconducting behavior, their transport properties are dominated by two different mechanisms, namely, the electronic transport of x⩽0.5 samples is realized by thermal activation but the variable-range hopping is applied in x⩾0.7 ones. The different transport mechanism can be understood from the Mn/Fe ions interaction.