Fate of vacancy-induced supersolidity in 4He |
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Authors: | Boninsegni M Kuklov A B Pollet L Prokof'ev N V Svistunov B V Troyer M |
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Affiliation: | Department of Physics, University of Alberta, Edmonton, Alberta T6G 2J1, Canada. |
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Abstract: | 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 4He 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 4He 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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