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Instability of Vacancy Clusters in Solid 4 | He

The behavior of pairs and clusters of vacancies in solid4 He crystals is studied with diffusion Monte Carlo method. We use a trial function suitable for describing solid4 He with long range order, arbitrary number of unoccupied sites and explicit Bose symmetry. It is found that vacancy clusters are... Full description

Main Author: Lutsyshyn, Y.
Contributors: Cazorla, C. | Author
Boronat, J. | Author
Contained in: Journal of Low Temperature Physics Dordrecht : Springer Science + Business Media B.V Vol. 158, No. 3/4 (2010), p. 608-614
Journal Title: Journal of Low Temperature Physics
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Links: Volltext (dx.doi.org)
ISSN: 1573-7357
Additional Keywords: Clusters
Defects
OriginalPaper
Supersolid
Vacancies
DOI: 10.1007/s10909-009-0004-y
Language: English
Physical Description: Online-Ressource
ID (e.g. DOI, URN): 10.1007/s10909-009-0004-y
s10909-009-0004-y
PPN (Catalogue-ID): SPR030951550
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520 |a The behavior of pairs and clusters of vacancies in solid4 He crystals is studied with diffusion Monte Carlo method. We use a trial function suitable for describing solid4 He with long range order, arbitrary number of unoccupied sites and explicit Bose symmetry. It is found that vacancy clusters are unstable and collapse in all considered systems. We find no signature of stability of bound vacancy clusters of any size. Vacancies are found to exhibit weak attraction and a rough estimation of the binding energy is reported. 
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