Experimental evidence of a state-point dependent scaling exponent of liquid dynamics
Abstract
A large class of liquids have hidden scale invariance characterized by a scaling exponent. In this letter we present experimental evidence that the scaling exponent of liquid dynamics is state-point dependent for the glass-forming silicone oil tetramethyl-tetraphenyl-trisiloxane (DC704) and 5-polyphenyl ether (5PPE). From dynamic and thermodynamic properties at equilibrium, we use a method to estimate the value of at any state point of the pressure-temperature plane, both in the supercooled and normal liquid regimes. We find agreement between the average exponents and the value obtained by superposition of relaxation times over a large range of state-points. We confirm the state-point dependence of by reanalyzing data of 20 metallic liquids and two model liquids.
Keywords
Cite
@article{arxiv.1807.11746,
title = {Experimental evidence of a state-point dependent scaling exponent of liquid dynamics},
author = {Alejandro Sanz and Tina Hecksher and Henriette Wase Hansen and Kristine Niss and Ulf R. Pedersen},
journal= {arXiv preprint arXiv:1807.11746},
year = {2019}
}