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Type: Artigo de periódico
Title: Zero-point divacancy concentration in the shadow wave function model for solid He-4
Author: Pessoa, R
de Koning, M
Vitiello, SA
Abstract: We address the issue of interaction between zero-point vacancies in solid He-4 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)x10(-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 similar to 4-5 times larger than the value expected in the absence of any clustering propensity, 2.5x10(-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.
Subject: ground states
phase separation
solid helium
vacancies (crystal)
wave functions
Country: EUA
Editor: Amer Physical Soc
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.80.172302
Date Issue: 2009
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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