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Emergence of glassy-like dynamics in an orientationally ordered phase

hal.structure.identifierDepartament de Fisica i Enginyeria Nuclear [UPC, Barcelone] [ETSEIB]
dc.contributor.authorROMANINI, M.
hal.structure.identifierLaboratoire Ondes et Matière d'Aquitaine [LOMA]
dc.contributor.authorNÉGRIER, Philippe
hal.structure.identifierDepartament de Fisica i Enginyeria Nuclear [UPC, Barcelone] [ETSEIB]
dc.contributor.authorTAMARIT, Jose Luis
hal.structure.identifierDipartimento di Fisica
dc.contributor.authorCAPACCIOLI, Simone
hal.structure.identifierDepartament de Fisica i Enginyeria Nuclear [UPC, Barcelone] [ETSEIB]
dc.contributor.authorBARRIO, María
hal.structure.identifierDepartament de Fisica i Enginyeria Nuclear [UPC, Barcelone] [ETSEIB]
dc.contributor.authorPARDO, Luis C.
hal.structure.identifierLaboratoire Ondes et Matière d'Aquitaine [LOMA]
dc.contributor.authorMONDIEIG, Denise
dc.date.created2011-09-27
dc.date.issued2012
dc.identifier.issn1098-0121
dc.description.abstractEnThe dynamics of a simple rigid pseudoglobular molecule (2-adamantanone) has been studied by means of dielectric spectroscopy and examined under the constraints imposed by the space group of the crystal structure determined by x-ray powder diffraction. The low-temperature monoclinic structure of 2-adamantanone, with one molecule per asymmetric unit (Z′=1), displays a statistical intrinsic disorder, concerning the site occupancy of the oxygen atom along three different sites. Such a physically identifiable disorder gives rise to large-angle molecular rotations which inherently lead to time-average fluctuations of the molecular dipole, thus contributing to the dielectric susceptibility. The dielectric spectra for the low-temperature "ordered" phase displays a universal feature of glassy-like materials, i.e., coexistence of α- and β-relaxation processes. The former is clearly identified with the strongly restricted reorientational motions within the long-range "ordered" crystalline lattice. The latter, never observed before in fully translationally and highly orientationally ordered phases, displays all the properties of an original Johari-Goldstein β-relaxation, in spite of the strong character of this glass-like phase. These findings can be explained according to the coupling model, applied to such "ordered" phases.
dc.language.isoen
dc.publisherAmerican Physical Society
dc.rights.urihttp://creativecommons.org/licenses/by-sa/
dc.title.enEmergence of glassy-like dynamics in an orientationally ordered phase
dc.typeArticle de revue
dc.identifier.doi10.1103/PhysRevB.85.134201
dc.subject.halChimie/Cristallographie
dc.subject.halPhysique [physics]/Matière Condensée [cond-mat]
bordeaux.journalPhysical Review B: Condensed Matter and Materials Physics (1998-2015)
bordeaux.page134201
bordeaux.volume85
bordeaux.issue13
bordeaux.peerReviewedoui
hal.identifierhal-00701309
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00701309v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Physical%20Review%20B:%20Condensed%20Matter%20and%20Materials%20Physics%20(1998-2015)&rft.date=2012&rft.volume=85&rft.issue=13&rft.spage=134201&rft.epage=134201&rft.eissn=1098-0121&rft.issn=1098-0121&rft.au=ROMANINI,%20M.&N%C3%89GRIER,%20Philippe&TAMARIT,%20Jose%20Luis&CAPACCIOLI,%20Simone&BARRIO,%20Mar%C3%ADa&rft.genre=article


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