Fabrication of high-temperature quasi-two-dimensional superconductors at the interface of a ferroelectric Ba${}_{0.8}$Sr${}_{0.2}$TiO${}_3$ film and an insulating parent compound of La${}_2$CuO${}_4$

Abstract

We report the first observation of superconductivity in heterostructure consisting of an insulating ferroelectric film (Ba${}_{0.8}$Sr${}_{0.2}$TiO${}_3$) grown on an insulating parent compound of La${}_2$CuO${}_4$ with [001] orientation. The heterostructure was prepared by magnetron sputtering on a non-atomically-flat surface with inhomogeneities of the order of 1-2 nm. The measured superconducting transition temperature T${}_c$ is about 30K. 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.

To be published in Phys. Rev. Lett

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• Emergence of high-temperature superconductivity at the interface of two Mott insulators
• Spontaneous generation of vortices by a nonuniform Zeeman field in a two-dimensional Rashba coupled superconductor
• Interaction of magnons with plasmons in a system of antiferromagnetic insulators coupled to a superconductor microwave cavity through the interfacial exchange interaction