Is the mysterious pseudogap in the copper oxide superconductors a signature of preformed pairs or a competing ordered state? Measurements of broken symmetries suggest that the pseudogap cannot originate from superconductivity alone.
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Hoffman, J. To pair or not to pair?. Nature Phys 6, 404–405 (2010). https://doi.org/10.1038/nphys1694
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DOI: https://doi.org/10.1038/nphys1694
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