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dc.contributor.authorCazorla Silva, Claudio
dc.contributor.authorLutsyshyn, Yaroslav
dc.contributor.authorBoronat Medico, Jordi
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear
dc.identifier.citationCazorla, C.; Lutsyshyn, Y.; Boronat, J. Elastic constants of incommensurate solid 4He from diffusion Monte Carlo simulations. "Physical review B: condensed matter and materials physics", 28 Juny 2013, vol. 87, núm. 21, p. 1-5.
dc.description.abstractWe study the elastic properties of incommensurate solid 4He in the limit of zero temperature. Specifically, we calculate the pressure dependence of the five elastic constants (C11, C12, C13, C33, and C44), longitudinal and transversal speeds of sound, and the T=0 Debye temperature of incommensurate and commensurate hcp 4He using the diffusion Monte Carlo method. Our results show that under compression, the commensurate crystal is globally stiffer than the incommensurate, however at pressures close to melting (i.e., P∼25 bar) some of the elastic constants accounting for strain deformations of the hcp basal plane (C12 and C13) are slightly larger in the incommensurate solid. Also, we find that upon the introduction of tiny concentrations of point defects, the shear modulus of 4He (C44) undergoes a small reduction.
dc.format.extent5 p.
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Spain
dc.subjectÀrees temàtiques de la UPC::Física
dc.subject.lcshMonte Carlo method
dc.titleElastic constants of incommensurate solid 4He from diffusion Monte Carlo simulations
dc.subject.lemacMontecarlo, Mètode de
dc.contributor.groupUniversitat Politècnica de Catalunya. SIMCON - First-principles approaches to condensed matter physics: quantum effects and complexity
dc.rights.accessOpen Access
dc.description.versionPostprint (published version)
local.citation.authorCazorla, C.; Lutsyshyn, Y.; Boronat, J.
local.citation.publicationNamePhysical review B: condensed matter and materials physics

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