We report the first observation of superconductivity in a heterostructure consisting of an insulating ferroelectric film (Ba0.8Sr0.2TiO3) grown on an insulating parent compound of La2CuO4 with  orientation. The heterostructure was prepared by magnetron sputtering on a nonatomically flat surface with inhomogeneities of the order of 1-2 nm. The measured superconducting transition temperature Tc is about 30 K. We have shown that superconductivity is confined near the interface region. Application of a weak magnetic field perpendicular to the interface leads to the appearance of the finite resistance. That confirms the quasi-two-dimensional nature of the superconductive state. The proposed concept promises ferroelectrically controlled interface superconductivity which offers the possibility of novel design of electronic devices.
ASJC Scopus subject areas
- Physics and Astronomy(all)