Pulsed versus DC I-V characteristics of resistive manganites
B. Fisher, J. Genossar, K. B. Chashka, L. Patlagan, G. M. Reisner
Abstract
We report on pulsed and DC I-V characteristics of polycrystalline samples of three charge-ordered manganites, Pr2/3Ca1/3MnO3, Pr1/2Ca1/2MnO3, Bi1/2Sr1/2MnO3 and of a double-perovskite Sr2MnReO6, in a temperature range where their ohmic resistivity obeys the Efros-Shklovskii variable range hopping relation. For all samples, the DC I(V) exhibits at high currents negative differential resistance and hysteresis, which mask a perfectly ohmic or a moderately nonohmic conductivity obtained by pulsed measurements. This demonstrates that the widely used DC I-V measurements are usually misleading.
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