A New Method to Measure the Drift Mobility in Doped Manganite Films

The travelling wave method has been used to measure the drift mobility in the paramagnetic-insulator state of La_0.75Sr_0.11Ca_0.14MnO₃ films. The thermal activation of the drift mobility in manganites has been measured for the first time. The mobility varies from 2.5×10^-2cm²/Vs at 310K to about 9.2×10^-2cm²/Vs at 400K. The Arrhenius behaviours of the conductivity and drift mobility indicate that the transport process in manganites above the Curie temperature is dominated by the thermally assisted hopping of small polarons.