The nature of the 'hidden order' in URu2Si2 has resisted characterization for the past twenty-five years. Recent photoemission results report the observation of a narrow heavy-fermion band that sharpens below the mysterious transition and provides new clues about its origins.
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Chandra, P., Coleman, P. The gathering storm of data. Nature Phys 5, 625–627 (2009). https://doi.org/10.1038/nphys1388
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DOI: https://doi.org/10.1038/nphys1388
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