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Nobody really understands why cuprates – highly-doped copper oxides – are high-temperature superconductors, and researchers in the UK and the Netherlands have now discovered that the materials don’t conform to conventional theories in their metallic state either. Instead, the researchers suggest that cuprates may contain a mix of “strange” and conventional metallic components, but this only poses a further question: which component is responsible for the cuprates’ superconductivity?

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