MICROCANONICAL SIMULATION OF THE SITE-DILUTED 3-DIMENSIONAL ISING-MODEL

We use a microcanonical simulation to obtain the phase diagram in the temperature-concentration space of the three-dimensional site-diluted Ising model, for concentrations of magnetic atoms in the range 1 less- than-or-equal-to p greater-than-or-equal-to 0.4. The temperature and c oncentration dependence of the magnetization, internal energy, and spe cific heat are calculated on 32 x 32 x 32 lattices. The resulting phas e diagram agrees well with recent Monte Carlo simulations and extends the numerical estimates up to the regime of strong dilution.