In the pseudogap phase of a high-temperature cuprate superconductor, conflicting evidence from different experiments points to a competing state or a precursor-to-superconductivity state. One single experiment now determines that both states exist.
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van der Marel, D. Beware of the pseudogap. Nature Phys 7, 10–11 (2011). https://doi.org/10.1038/nphys1890
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DOI: https://doi.org/10.1038/nphys1890
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