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The results of the study of high conducting areas at the interface between ferroelectric and insulating oxides Ba 0.8 Sr 0.2 TiO 3 /LaMnO 3 /Ba 0.8 Sr 0.2 TiO 3  on the MgO substrate are presented. It is shown that the electrical resistance of the heterostructure decreases significantly with cooling and exhibits metallic behavior at low temperatures. Green (514 nm) and infrared (1028 nm) laser illumination of Ba 0.8 Sr 0.2 TiO 3 /LaMnO 3 /Ba 0.8 Sr 0.2 TiO 3  heterostructure leads to a decrease in the electrical resistance. The time constant of the negative photoresistance effect is ∼30 ÷ 50 s.

Conductivity and photoresistance of the film heterostructure Ba 0.8 Sr 0.2 TiO 3 /LaMnO 3 /Ba 0.8 Sr 0.2 TiO 3 on the MgO substrate