Do relaxors behave like structural glasses ? Auteur(s): Hehlen B.
Conférence invité: International Workshop on Relaxors Ferroelectrics-IWRF (Stirin, CZ, 2014-10-12) 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. |