title: Nature of the entropy versus self-diffusivity plot for simple liquids.
abstract: The empirical relation (D(*))(alpha) = a exp[S] between the self-diffusion coefficient D(*) and the excess entropy S of a liquid is studied here in the context of theoretical model calculation. The coefficient alpha is dependent on the interaction potential and shows a crossover at an intermediate density, where cooperative dynamics become more important. Around this density a departure from the Stokes-Einstein relation is also observed. The above relation between entropy and diffusion is also tested for the scaled total diffusion coefficient in a binary mixture.
authors.affiliation: School of Physical Sciences, Jawaharlal Nehru University, New Delhi, India.
authors.forename: Charanbir
authors.initials: C
authors.lastname: Kaur
authors.forename: Upendra
authors.initials: U
authors.lastname: Harbola
authors.forename: Shankar P
authors.initials: SP
authors.lastname: Das