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To form a conducting layer at the interface between the oxide insulatorsLaAlO3 and SrTiO3, the LaAlO3 layer on the SrTiO3 substrate must be at leastfour unit-cells-thick. The LaAlO3 SrTiO3 heterointerface thus formed exhibitsvarious intriguing phenomena such as ferromagnetism and superconductivity. Ithas been widely studied for being a low-dimensional ferromagnetic oxidesuperconducting system with a strong gate-tunable spin-orbit interaction.However, its lack of stability and environmental susceptiveness have been anobstacle to its further experimental investigations and applications. Here, wedemonstrate that capping the bilayer with SrTiO3 relieves this thickness limit,while enhancing the stability and controllability of the interface. Inaddition, the SrTiO3-capped LaAlO3 exhibits unconventional superconductivity;the critical current dramatically increases under a parallel magnetic field,and shows a reversed hysteresis contrary to the conventional hysteresis ofmagnetoresistance. Its superconducting energy gap of $\Delta \sim 1.31k_BT_c$also deviates from conventional BCS-type superconductivity. The oxide trilayercould be a robust platform for studying the extraordinary interplay ofsuperconductivity and ferromagnetism at the interface electron system betweenLaAlO3 and SrTiO3.

Interplay between superconductivity and magnetism in one-unit-cell LaAlO3 capped with SrTiO3