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In this work, we report direct as well as pulsed electric field-inducedresistivity switching and its relaxation in a multiferroic insulator La2NiMnO6.At a fixed base temperature (Tb), the dc resistivity switches abruptly from ahigh to a low value, which is manifested as an upward jump in the dc currentdensity (J) when the electric field (E) exceeds a threshold value Eth. Thefractional change in the resistance is as much as 70 % at room temperature forEth = 95 V/cm. The Eth increases with lowering Tb and follows the relationEth(Tb) = Eth(0)exp[-Tb/T0], as similar to the behavior found in charge densitywave systems. It is shown that the abrupt jump in J vanishes under pulsedelectric fields if the period between pulses is long enough. Surprisingly, astep-like increase in J also occurs at a fixed dc electric field (Ec) and T =Tb, above a threshold waiting time (tth). The tth decreases with increasing Ecand Tb. Simultaneous measurement of surface temperature during the J-E sweepand temporal studies suggest that conductive channels are created in aninsulating matrix due to the local self heating, and the coalescence of thesechannels above a threshold E- field or time causes the observed anomalies in J.However, the dissipated Joule power (P = Ith2R) at the transition from high tolow resistive state in the sample decreases with lowering temperature, whichsuggests that the Joule heating is the consequence of transition from the highto low resistance state rather than itself a driving force of the non linearelectrical transport. In addition, non linear J-E characteristics is also foundeven with a pulsed voltage sweep, which suggests that intrinsic mechanismsother than self heating is still active in this material.

Electric field-induced colossal electroresistance and its relaxation in multiferroic La2NiMnO6