Photoresponsive character of double-doped La2∕3(Ca1∕3Sr2∕3)1∕3MnO3 film

Abstract

The transient resistance change induced by modulated laser pulse has been observed in the double-doped perovskite La2∕3(Ca1∕3Sr2∕3)1∕3MnO3 thin film prepared by rf magnetron sputtering method. The time response character of photoinduced voltage signal is independent of the bias current, but its photoinduced relative change in resistance is nonlinearly dependent on the bias current. All the phenomena in the perovskite film is explained by the double exchange model and the small polaron theory. This is very important in the practical application of a colossal magnetoresistance photoelectric switch.