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dc.contributor.authorCui, Bingyu
dc.contributor.authorGebbia, Jonathan Fernando
dc.contributor.authorTamarit Mur, José Luis
dc.contributor.authorZaccone, Asessio
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Física
dc.identifier.citationCui, B., Gebbia, J., Tamarit, J. Ll., Zaconne, A. Disentangling a and ß relaxation in orientationally disordered crystals with theory and experiments. "Physical review E", 21 Maig 2018, vol. 97, p. 053001-1-053001-7.
dc.description.abstractWe use a microscopically motivated Generalized Langevin Equation (GLE) approach to link the vibrational density of states (VDOS) to the dielectric response of orientational glasses (OGs). The dielectric function calculated based on the GLE is compared with experimental data for the paradigmatic case of two OGs: Freon 112 and Freon 113, around and just above Tg. The memory function is related to the integral of the VDOS times a spectral coupling function Y(¿p), which tells the degree of dynamical coupling between molecular degrees of freedom at different eigenfrequencies. The comparative analysis of the two Freons reveals that the appearance of a secondary ß relaxation in Freon 112 is due to cooperative dynamical coupling in the regime of mesoscopic motions caused by stronger anharmonicity (absent in Freon 113), and is associated with comparatively lower boson peak in the VDOS. The proposed framework brings together all the key aspects of glassy physics (VDOS with boson peak, dynamical heterogeneity, dissipation, anharmonicity) into a single model.
dc.publisherAmerican Institute of Physics (AIP)
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Spain
dc.subjectÀrees temàtiques de la UPC::Física
dc.subject.lcshPlastic crystals
dc.subject.lcshBrownian movements
dc.titleDisentangling a and ß relaxation in orientationally disordered crystals with theory and experiments
dc.subject.lemacCristalls plàstics
dc.subject.lemacMoviment brownià
dc.contributor.groupUniversitat Politècnica de Catalunya. GCM - Grup de Caracterització de Materials
dc.description.peerreviewedPeer Reviewed
dc.rights.accessOpen Access
dc.description.versionPostprint (published version)
upcommons.citation.authorCui, B., Gebbia, J., Tamarit, J. Ll., Zaconne, A.
upcommons.citation.publicationNamePhysical review E

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