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I-V Characteristics of Resistive Oxides: DC versus Pulsed Measurements

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Fisher B., Genossar J., Chashka K., Patlagan L., Reisner G.

Acta Physica Polonica A

2007

vol. 111

issue 1

57-61

We investigated pulsed and DC I-V characteristics of a variety of resistive oxides. Examples of pulsed, compared with DC characteristics, are shown for samples of La_{1.2}Sr_{1.8}Mn_2O_7 (a double layer manganite), Pr_{2/3}Ca_{1/3}MnO_3 and Bi_{1/2}Sr_{1/2}MnO_3 (charge-ordered manganites), Sr_2FeMoO_6, Sr_2CrWO_6 and Ba_2MnReO_6 (double perovskites). For pulsed measurements, single pulses in the ms range were applied. For short-rise-time square pulses, the Joule heating is negligible, as long as the response remains independent of time. The DC I-V characteristics were measured up to current runaway in the negative resistance regime;Δ T never exceeded a fraction of a degree. In most cases the DC characteristics mask a perfectly ohmic or moderately non-ohmic conductivity obtained by pulsed measurements. This demonstrates that the widely used DC I-V measurements in the high current regime are frequently misleading.

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1 Acta Physica Polonica A

1 2007

1 Chashka K.

1 Fisher B.

1 Genossar J.

1 Patlagan L.

1 Reisner G.

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I-V Characteristics of Resistive Oxides: DC versus Pulsed Measurements