Electroresistance and current-induced metastable states in the thin film of half-doped manganite Pr0.5Sr0.5MnO3

Electroresistance (ER) effects and current-induced metastable states in the thin film of Pr0.5Sr0.5MnO3 were investigated. The initial state was insensitive to weak currents and susceptible to high-density currents. As the current density reached a certain value, metastable states, which were very sensitive to weak currents at low temperatures, were excited. It was found that as the excited current increased, the induced metastable state showed a larger electroresistance in a wider temperature range. Interfacial effects related to electrodes could be ruled out. The observed effects might be related to the coexistence and instability of the multiphases in manganites.

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