Twenty-five years on from its discovery, high-temperature superconductivity remains without a satisfactory explanation. The latest studies on the electronic phase diagram of copper oxide compounds reveal why this is so. See Letter p.73
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Grant, P. The great quantum conundrum. Nature 476, 37–39 (2011). https://doi.org/10.1038/476037a
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DOI: https://doi.org/10.1038/476037a
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