Magnets built of molecular rings of magnetic ions are fundamental model systems for studying the complex correlations and dynamics of quantum spins at the atomic scale. A new generation of neutron spectrometers can reveal complete four-dimensional maps of the spin correlations in spin rings.
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Rüegg, C. Lord of the rings. Nature Phys 8, 859–860 (2012). https://doi.org/10.1038/nphys2461
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DOI: https://doi.org/10.1038/nphys2461