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dc.contributor.authorMulet, Robertopt_BR
dc.contributor.authorStariolo, Daniel Adrianpt_BR
dc.date.accessioned2015-01-21T02:17:22Zpt_BR
dc.date.issued2007pt_BR
dc.identifier.issn1098-0121pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/109090pt_BR
dc.description.abstractThe Langevin dynamics of a system with a scalar-order parameter exhibiting a fluctuation-induced firstorder phase transition is solved within the self-consistent Hartree approximation. Competition between interactions on short and long length scales gives rise to spatial modulations in the order parameter, such as stripes in 2d and lamellae in 3d. We show that when the time scale of observation is small compared with the time needed for the formation of modulated structures, the dynamics is dominated by a standard ferromagnetic contribution plus a correction term. However, once these structures are formed, the long-time dynamics is no longer purely ferromagnetic. After a quench from a disordered state to low temperatures, the system develops growing domains of stripes lamellae. Due to the character of the transition, the paramagnetic phase is metastable at all finite temperatures, and the correlation length diverges only at T=0. Consequently, the temperature is a relevant variable: for T >0 the system ends up forming domains of stripes with a finite correlation length while for T=0 a scaling behavior in space and time, characteristic of smectic order, is obtained.en
dc.format.mimetypeapplication/pdf
dc.language.isoengpt_BR
dc.relation.ispartofPhysical review. B, Condensed matter and materials physics. Woodbury. Vol. 75, no. 6 (Feb. 2007), 064108 12p.pt_BR
dc.rightsOpen Accessen
dc.subjectModelo de isingpt_BR
dc.subjectLiquidos sobreesfriadospt_BR
dc.subjectCinéticapt_BR
dc.subjectTransformações de fasept_BR
dc.titleLangevin dynamics of fluctuation-induced first-order phase transitions : self-consistent Hartree approximationpt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000594263pt_BR
dc.type.originEstrangeiropt_BR


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