Modeling the nonlinear dielectric response of glass formers

Abstract

The recently developed pragmatical model of asymmetric double-well potentials with a finite lifetime is applied to nonlinear dielectric data in polar undercooled liquids. The viscous effects from the finite lifetime provide a crossover from the cooperative jumps of many molecules at short times to the motion of statistically independent molecules at long times. The model allows to determine the size of cooperatively rearranging regions from nonlinear ω-data and throws a new light on a known inconsistency between nonlinear ω and 3ω-signals for glycerol and propylene carbonate.

Version 4 after hot discussions with Referees

Cited by in corpus (3)

• Nonlinear dielectric spectroscopy in a fragile plastic crystal
• Investigation of nonlinear effects in glassy matter using dielectric methods
• A pragmatical access to the viscous flow