Physicists have long debated whether the 'hidden order' in URu2Si2 is itinerant or localized, and it remains inaccessible to direct external probes. The observation of an overdamped collective mode seems to resolve this outstanding issue.
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Tripathi, V., Chandra, P. & Coleman, P. Sleuthing hidden order. Nature Phys 3, 78–80 (2007). https://doi.org/10.1038/nphys524
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DOI: https://doi.org/10.1038/nphys524
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