FERROMAGNETIC ORDER-DISORDER TRANSITION IN AN ISING FLUID

The Ising fluid we have investigated is a system of hard spheres which carry an Ising spin. A short range ferromagnetic potential acts betwe en particles. A renormalization group study of the model, based on the hierarchical reference theory of fluids, gives quantitative predictio ns on the phase diagram and the phase boundaries. The model can show t wo distinct phase transitions: a magnetic order-disorder transition an d a liquid-vapor phase separation which meet at a tricritical point. T he critical properties of the magnetic transition have been studied by Monte Carlo simulations at two densities in systems with up to 4000 p articles. The locations of the critical points are in good agreement w ith the theoretical estimates. However, a finite-size scaling analysis shows effective critical exponents which deviate from the expected Is ing values. These discrepancies resemble the analogous result of a pre vious numerical study of Heisenberg fluids. Here they are interpreted as due to crossover phenomena, partly related to Fisher exponent renor malization induced by the presence of noncritical density fluctuations .