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Solid state ionic approaches for modifying ion distributions in getter/oxideheterostructures offer exciting potentials to control material properties. Herewe report a simple, scalable approach allowing for total control of thesuperconducting transition in optimally doped YBa$_{2}$Cu$_{3}$O$_{7-{\delta}}$(YBCO) films via a chemically-driven ionic migration mechanism. Using a thin Gdcapping layer of up to 20 nm deposited onto 100 nm thick epitaxial YBCO films,oxygen is found to leach from deep within the YBCO. Progressive reduction ofthe superconducting transition is observed, with complete suppression possiblefor a sufficiently thick Gd layer. These effects arise from the combined impactof redox-driven electron doping and modification of the YBCO microstructure dueto oxygen migration and depletion. This work demonstrates an effective ioniccontrol of superconductivity in oxides, an interface induced effect that goeswell into the quasi-bulk regime, opening up possibilities for electric fieldmanipulation.

Interfacial-Redox-Induced Tuning of Superconductivity in YBa$_{2}$Cu$_{3}$O$_{7-{\delta}}$