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On the Stability of Small Vacancy Clusters in Solid 4 | He

We study numerically properties of multiple vacancies in solid4 He at zero temperature. Up to four vacancies were introduced into the solid through incommensuration between the number of available lattice sites and the actual number of atoms. Vacancy-vacancy correlation function increases at very sh... Full description

Main Author: Lutsyshyn, Y.
Contributors: Rota, R. | Author
Boronat, J. | Author
Contained in: Journal of Low Temperature Physics Dordrecht : Springer Science + Business Media B.V Vol. 162, No. 5/6 (2011), p. 455-463
Journal Title: Journal of Low Temperature Physics
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Links: Volltext (dx.doi.org)
ISSN: 1573-7357
Additional Keywords: OriginalPaper
Solid helium
Supersolid
Vacancy
DOI: 10.1007/s10909-010-0301-5
Language: English
Physical Description: Online-Ressource
ID (e.g. DOI, URN): 10.1007/s10909-010-0301-5
s10909-010-0301-5
PPN (Catalogue-ID): SPR03095455X
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520 |a We study numerically properties of multiple vacancies in solid4 He at zero temperature. Up to four vacancies were introduced into the solid through incommensuration between the number of available lattice sites and the actual number of atoms. Vacancy-vacancy correlation function increases at very short distances indicating effective vacancy attraction between vacancies located on nearby lattice sites. The decay of the pair correlation function at large distances puts an upper bound on the absolute value of the binding energy varying from 4 mK at melting density to 150 mK at the highest considered density$\rho=32.2~\mbox{nm$^{-3}$}$, and no lower bound; either the four-vacancy clusters are unbound, or are bound too weakly for the temperatures of the supersolid experiments. 
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653 |a Supersolid 
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700 1 |a Boronat, J.  |e verfasserin  |4 aut 
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