NONVOLATILE MEMORY ELEMENT

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Provided is a material composition which allows the preparation of a nonvolatile memory element comprising a perovskite-type transition metal oxide having the CER effect by the use of three chemical elements. A nonvolatile memory element, which comprises an electric conductor having a shallow work function or a small electronegativity, such as Ti, as an electrode, and a rare earth-copper oxide comprising a rare earth element, copper and oxygen, such as La2CuO4, as a material constituting a heterojunction with the electric conductor.