Effects of oxygen depletion on photoinduced and transport properties of thin films of charge-ordered manganites

摘要

In this paper, we report a study of conductive and photoinduced properties of charge-ordered Bi_(0.4)Ca_(0.6)MnO_3 thin films with different oxygen contents. The oxygen content of the films was varied following different annealing or deposition protocols. Change in film's resistivity during annealing reflects oxygen dynamics at high temperatures. It was found that oxygen-deficient films exhibit a significant increase in the photoinduced resistivity changes and the lifetime of photoinduced conductive phase. Possible origin of this effect is discussed.