Dynamics of the Photoinduced Resistance at the Ba0.8Sr0.2TiO3/LaMnO3 Heterostructure Interface.

The effect of green (514 nm) and infrared (1028 nm) pulsed laser light on the electrical resistance at the interface of a Ba_0.8Sr_0.2TiO₃/LaMnO₃ heterostructure is studied. Illumination is shown to cause, at low temperatures of 80–200 K, an increase in the resistance along the interface by a value of up to 2–15% from the initial value. The characteristic time of the transient dynamics of varying the resistance is 4–12 s. The effect of the photoinduced resistance is observed either at both green and infrared illumination; in this case, the effect of green-light illumination is significantly higher. Illumination is carried out by a defocused laser beam; thus, the effect cannot be related to heating of the interface region. The effects are shown to add up during simultaneous illumination with green and infrared light. [ABSTRACT FROM AUTHOR]