Abstract
Quantum crystals are crystals with large zero-point motions, caused by a light mass and a weak interaction of the lattice particles. Among these are the solid phases of the quantum liquids 4He and 3He, molecular hydrogen, and solid neon. The existence of large zero-point motions can cause striking effects, e.g., the existence of a sizable nuclear exchange interaction in 3He or a wavelike propagation of vacancies or isotopic impurities.
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