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High-temperature superconductivity

The sound of a hidden order

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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Figure 1: Electronic order.


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Correspondence to Jan Zaanen.

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Zaanen, J. The sound of a hidden order. Nature 498, 41–42 (2013).

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