Ultrasound measurements in a copper oxide superconductor have revealed an exotic phase of matter, composed of loops of spontaneous quantum currents, that has hitherto excelled at evading observation. See Letter p.75
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Zaanen, J. The sound of a hidden order. Nature 498, 41–42 (2013). https://doi.org/10.1038/498041a
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DOI: https://doi.org/10.1038/498041a
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