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High-temperature cuprate superconductors have naturally a superlatticestructure. Infinite-layer CaCuO2 is the common ingredient of cuprates withsuperconducting transition temperatures above 100 K. However, infinite-layerCaCuO2 by itself does not superconduct. Here we show that superconductivityemerges in artificial superlattices built from infinite-layer CaCuO2 andbrownmillerite Ca2Fe2O5 grown by molecular beam epitaxy. X-ray diffraction andelectron microscopy characterizations showed that the crystal quality of theinfinite-layer CaCuO2 in the superlattices significantly improved compared tobare thin-films of CaCuO2. We found that the induction of superconductivity in[(CaCuO2)n(Ca2Fe2O5)m]N superlattices is also subject to the oxidizingenvironment used during the cool-down procedure and therefore to a minimizationof oxygen vacancies within the CuO2 planes. The inserted Ca2Fe2O5 layers buffercharge imbalances triggered by point defect formation during growth, minimizingcationic defects in the infinite-layer CaCuO2 layers thus stabilizingmonolithic infinite-layer CaCuO2 slabs; embedding CaCuO2 within a superlatticeenables extended two-dimensional CuO2 planes and therefore superconductivitywhile Ca2Fe2O5 serves similar to the charge-reservoir layers in the cupratesuperconductors synthesized from incongruent melts.

Superconductivity in infinite-layer CaCuO2-brownmillerite Ca2Fe2O5 superlattices