Abstract
Influence of electric currents with a high density on the transport behavior of La 0.9Hf 0.1MnO 3 thin films has been investigated in the absence of magnetic field. With different dc-currents from I = 0.5 mA (current density J = 1.0 × 10 3 A/cm 2) to 25.0 mA ( J = 4.8 × 10 4 A/cm 2) applied on the sample, a striking observation is the significant decrease of the metal-insulator transition peak. The observed reduction ratio, the electroresistance ER = [ R(0) − R(I)]/ R(I) is ∼20%. This observation is similar to what we observed in other CMR systems like La 1− x Ca x MnO 3 and La 1− x Ba x MnO 3, indicating that the current-induced ER is a common feature for the CMR materials. The introduced new state is metastable and can be well repeated. Experiments revealed that it is not caused by oxygen deficiency. Although the nature behind such an effect has not been well understood yet, the observed ER effect seems to favor a percolative phase separation picture.
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