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- Do relaxors behave like structural glasses ?

Auteur(s): Hehlen B.

Conférence invité: International Workshop on Relaxors Ferroelectrics-IWRF (Stirin, CZ, 2014-10-12)

Texte intégral en Openaccess : fichier doc


Résumé:

Despite very different structural properties, relaxors exhibit many of the vibrational and thermal properties specific to the glassy state. These include low-lying vibrations (boson peak?), a plateau in the thermal conductivity at low temperature, a strong scattering regime of acoustic waves, a stretched exponential behavior of the relaxational dynamics, and the appearance of two level systems below ~2 K, among others. These features most likely originate from the strong and isotropic disorder at nanometric scale in these two otherwise very different classes of materials. I will discuss these behaviors from the point of view of glass physics.