Physicists have puzzled over a hidden electronic order in a uranium-based material for decades. A new theory attributes it to not just a single but a double breaking of time-reversal symmetry. See Article p.621
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Si, Q. Hidden is more. Nature 493, 619–620 (2013). https://doi.org/10.1038/493619a
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DOI: https://doi.org/10.1038/493619a
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