2014/08/30 by Massimo Pica Ciamarra, M. Pica Ciamarra, Peter Sollich · 1 citation
Materials Science · Mathematics · Physics and Astronomy · #Elastic energy #Elastic modulus #Elasticity (physics) #Energy landscape #Glass properties and applications #Glass transition #Liquid Crystal Research Advancements #Material Dynamics and Properties #Materials science #Mathematics #Physics #Plateau (mathematics) #Polymer #Power law #Relaxation (psychology) #Shear modulus #Statistical physics #Thermodynamics #Viscoelasticity #Work (physics) #cond-mat.soft
paper · pdf · doi:10.1016/j.jnoncrysol.2014.08.019
published as Journal of Non-Crystalline Solids 407, 23 (2015) · Proceedings of 7th International Discussion Meeting on Relaxations in Complex Systems (IDMRCS)
openalex publication_date 2014/08/30 · arxiv created 2015/08/19 · arxiv updated 2015/08/20 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Elastic models of the glass transition relate the relaxation dynamics and the elastic properties of structural glasses. They are based on the assumption that the relaxation dynamics occurs through activated events in the energy landscape whose energy scale is set by the elasticity of the material. Here we investigate whether such elastic models describe the relaxation dynamics of systems of particles interacting via a purely repulsive harmonic potential, focusing on a volume fraction and temperature range that is characterized by entropy--driven water--like density anomalies. We do find clear correlations between relaxation time and diffusivity on the one hand, and plateau shear modulus and Debye--Waller factor on the other, thus supporting the validity of elastic models of the glass transition. However, we also show that the plateau shear modulus is not related to the features of the underlying energy landscape of the system, at variance with recent results for power--law potentials. This challenges the common potential energy landscape interpretation of elastic models.