Abstract
We report on electronic transport measurements on polycrystalline, non-metallic samples of doped-LaMnO3, in the ohmic and non-ohmic regimes. The non-ohmic regime has been investigated using d.c. as well as pulsed measurements. Large nonlinear conductivity of electronic origin, was found with pulsed currents in (nominal) La0.8Li0.2MnO3, LaMnO3+δ and in La0.8Ca0.2Mn0.95O3 at low temperatures under electric fields E < 500 V/cm. Their thermopowers exhibit maxima associated with the onset of (partial) magnetic order. For all samples, including some with perfectly linear pulsed I-V characteristic, the d.c. characteristics show, under similar fields, large nonlinearity and hysteresis, typical of self-heating in samples with activated conductivity.
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