Document Type
Article
Publication Date
8-1-1999
Publication Title
Physical Review E
Abstract
Soft vibrational modes have been used to explain anomalous thermal properties of glasses above 1 K. The soft-potential model consists of a collection of double-well potentials that are distorted by a linear term representing local stress in the liquid. Double-well modes contribute to the configurational entropy of the system. Based on the Adam-Gibbs theory of entropically driven relaxation in liquids, we show that the presence of stress drives the transition from Arrhenius to Zwanzig-Bässler temperature dependence of relaxation times. At some temperature below the glass transition, the energy scale is dominated by local stress, and soft modes are described by single wells only. It follows that the configurational entropy vanishes, in agreement with the “Kauzmann paradox.” We discuss a possible connection between soft vibrational modes and ultrafast processes that dominate liquid dynamics near the glass transition.
Repository Citation
Zürcher, Ulrich and Keyes, T., "Configurational Entropy and Collective Modes in Normal and Supercooled Liquids" (1999). Physics Faculty Publications. 271.
https://engagedscholarship.csuohio.edu/sciphysics_facpub/271
DOI
10.1103/PhysRevE.60.2065
Version
Publisher's PDF
Publisher's Statement
©1999 American Physical Society
Volume
60
Issue
2
