Continuous demixing at liquid-vapor coexistence in a symmetrical binary fluid mixture.
We report a Monte Carlo finite-size scaling study of the demixing transition of a symmetrical Lennard-Jones binary fluid mixture. For equal concentration of species, and for a choice of the unlike-to-like interaction ratio delta=0.7, this transition is found to be continuous at liquid-vapor coexistence. The associated critical end point exhibits an Ising-like universality. These findings confirm those of earlier smaller scale simulation studies of the same model, but contradict the findings of recent integral equation and hierarchical reference theory investigations.
Wilding
Nigel B
NB
Department of Physics, University of Bath, Bath BA2 7AY, United Kingdom.