The flow behaviour of solid helium at very low temperatures has recently generated as much controversy as excitement. An experiment looking directly at the grain boundaries offers fresh insights.
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B. K. Clarke
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Ceperley, D. Supersolid: crystal or plastic?. Nature Phys 2, 659–660 (2006). https://doi.org/10.1038/nphys424
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DOI: https://doi.org/10.1038/nphys424
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