Buffer layers for REBCO films for use in superconducting devices

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A superconducting article includes a substrate having a biaxially textured surface. A biaxially textured buffer layer, which can be a cap layer, is supported by the substrate. The buffer layer includes a double perovskite of the formula A2B′B″O6, where A is rare earth or alkaline earth metal and B′ and B″ are different transition metal cations. A biaxially textured superconductor layer is deposited so as to be supported by the buffer layer. A method of making a superconducting article is also disclosed.