Correlation between effects of electric current and magnetic field on transport properties of electron-doped manganite La0.7Ce0.3MnO3 thin films

摘要

We report the effect of electric current and magnetic field, separately and in conjugation, on the transport behaviour of patterned La0.7Ce0.3MnO3 thin films. In the absence of a magnetic field, a significant reduction in peak resistance ( R-p) was found with increasing bias current. This effect is also present when a magnetic field is applied, though the magnitude of the electroresistance ( ER = [ R( I = 0.05 mu A) - R( I = 50 mu A)]/ R( I = 50 mu A)) decreases. The metal - insulator transition temperature ( T-p) increases both with increasing current and with magnetic field. We observe an interesting correlation between electric current and magnetic field: the magnetoresistance ( MR = [ R-H=0 R-H=1 T]/ R-H=0) decreases with increasing bias current, while ER decreases with increasing magnetic field. Both ER and MR show a maximum near Tp. The interesting correlation between these two effects suggests that both these effects arise from the same origin.