For high-temperature superconductors, results from more refined experiments on better-quality samples are issuing fresh challenges to theorists. It could be that a new state of matter is at play, with unconventional excitations.
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Poilblanc, D. Beyond convention. Nature Phys 4, 16–17 (2008). https://doi.org/10.1038/nphys823
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DOI: https://doi.org/10.1038/nphys823
