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Longitudinal acoustic phonons with few-GHz frequency were detected in three-dimensional supracrystals [1] (with face-center cubic lattice) of 7-nm cobalt nanocrystal spheres [2]. In analogy with usual atomic crystals, where longitudinal acoustic phonons propagate with the speed of sound through coherent movements of atoms of the lattice out of their equilibrium positions [3], in these supracrystals...
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