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Fate of vacancy-induced supersolidity in 4He

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PHYSICAL REVIEW LETTERS
卷 97, 期 8, 页码 -

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AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.97.080401

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The supersolid state of matter, exhibiting nondissipative flow in solids, has been elusive for 35 years. The recent discovery of a nonclassical moment of inertia in solid He-4 by Kim and Chan provided the first experimental evidence, although the interpretation in terms of supersolidity of the ideal crystal phase remains a subject to debate. Using quantum Monte Carlo methods we investigate the long-standing question of vacancy-induced superflow and find that vacancies in a He-4 crystal phase separate instead of forming a supersolid. On the other hand, nonequilibrium vacancies relaxing on defects of polycrystalline samples could provide an explanation for the experimental observations.

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