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|Type:||Artigo de periódico|
|Title:||Zero-point Divacancy Concentration In The Shadow Wave Function Model For Solid 4he|
De Koning M.
|Abstract:||We address the issue of interaction between zero-point vacancies in solid H4 e as described within the shadow wave function model. Applying the reversible-work method and taking into account finite-size effects, we obtain a zero-point monovacancy concentration of (2.03±0.02) × 10-3, which is slightly higher than the result due to Reatto for the same model. Utilizing the same methodology, we then consider the divacancy, taking into account both the in-plane as well as out-of-plane configurations with respect to the basal plane. We find no significant anisotropy between both conformations. Furthermore, although there is a small binding tendency, the expected divacancy concentration is only ∼4-5 times larger than the value expected in the absence of any clustering propensity, 2.5× 10-5. This result suggests that, within the employed model description, no vacancy aggregation leading to phase separation is to be expected in the ground state. © 2009 The American Physical Society.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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