Instability of Vacancy Clusters in Solid 4He

The behavior of pairs and clusters of vacancies in solid 4 He crystals is studied with diffusion Monte Carlo method. We use a trial function suitable for describing solid 4 He with long range order, arbitrary number of unoccupied sites and explicit Bose symmetry. It is found that vacancy clusters ar...

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Bibliographic Details
Published in:Journal of low temperature physics 2010-02, Vol.158 (3-4), p.608-614
Main Authors: Lutsyshyn, Y., Cazorla, C., Boronat, J.
Format: Article
Language:English
Subjects:
Attraction
Characterization and Evaluation of Materials
Clusters
Condensed Matter Physics
Crystals
Diffusion
Lattice vacancies
Low temperature physics
Magnetic Materials
Magnetism
Physics
Physics and Astronomy
Signatures
Stability
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Summary:The behavior of pairs and clusters of vacancies in solid 4 He crystals is studied with diffusion Monte Carlo method. We use a trial function suitable for describing solid 4 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.
ISSN:0022-2291
1573-7357
DOI:10.1007/s10909-009-0004-y