The influence of polydispersity on the phase equilibrium properties and the heat capacity of a dipolar system with additional short-range $(\text{repulsive}+\text{attractive})$ interactions (modeled by a shifted Lennard-Jones pair potential) is studied by means of a Monte Carlo scheme. The particle distribution of the investigated system is realized in the semigrand ensemble by tuning appropriately the underlying particle distribution density. The phase coexistence and heat capacity data are calculated with and without an applied magnetic field, and the obtained results are compared with the data determined in a monodisperse equivalent of the system.

• Received 23 November 2004

DOI:https://doi.org/10.1103/PhysRevE.71.031109