Physics and Astronomy
A molecular-dynamics simulation is carried out for particles (tracers) interacting with a screened Coulomb potential in three dimensions. A phase transition is observed from a liquid to an fcc solid on reducing the temperature at a fixed density, consistent with previous studies. In the liquid phase, the variation of the rms displacement R(tr) of the charged particles with time seems to depend on the density and the temperature. In the short-time regime, the effective exponent k for the subdiffusive power-law behavior, i.e., R(tr) is similar to t(k), decreases on increasing the density and lowering the temperature. A crossover from subdiffusive to a diffusive behavior is observed for a wide density regime in the liquid phase. At high temperatures and large densities, a single power law does not seem to describe the variation of R(tr) with t.
Physical Review E
Pandey, R. B.
(1993). Evidence of a Nondiffusive Transport in a Monodisperse Screened Coulomb System by a Molecular-Dynamics Simulation. Physical Review E, 47(5), 3246-3250.
Available at: http://aquila.usm.edu/fac_pubs/6479