Paramagnons with unexpectedly long lifetimes are observed in the paramagnetic state at temperatures above the antiferromagnetic ordering temperature in TlCuCl3, posing a challenge to theory.
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Sushkov, O. The long and the short of it. Nature Phys 10, 339–340 (2014). https://doi.org/10.1038/nphys2955
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DOI: https://doi.org/10.1038/nphys2955