Polaronic transport in both the paramagnetic and ferromagnetic phases of La0.95Mg0.05MnO3

Measurements of the field and temperature dependent electrical resistivity and ac susceptibility of LaMnO3 doped with 5% Mg are presented. Analysis of these data reveal that while this system undergoes a ferromagnetic transition at Tc = 147.2?0.2?K, it remains semiconducting over the entire temperature range examined (90?T?330?K). In particular, these resistivity data are well fit by the form appropriate for adiabatic small polaron hopping for both T>Tc and T