Current density and intrinsic electroresistance of the Sm1−xSrxMnO3 manganite Original Research Article

We experimentally investigate the role of geometry on the current and current density dependencies of the intrinsic electroresistance of Sm1−xSrxMnO3 of two compositions (x=0.40 and x=0.45). It is found that for each composition, the plot of the intrinsic electroresistance versus current density for samples with different dimensions and resistances coincide whereas this does not happen in the case of the electroresistance versus the magnitude of the current. These results confirm that the current density is indeed the relevant “universal” parameter for controlling the intrinsic electroresistance of these manganites.