Reentrant melting in the Gaussian-core model: The entropy imprint

We computed the residual multiparticle entropy of a classical system of penetrable particles, softly repelling each other through a bounded Gaussian potential, and traced out the ordering line associated with the vanishing of this quantity in the fluid phase. The comparison with the reentrant fluid-solid coexistence line shows that a congruent indication of the local ordering process that is ultimately responsible for the freezing - at low temperatures - of the dilute fluid under compression as well as of the dense fluid upon expansion is unambiguously rooted in the configurational entropy of the disordered phase.