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Critical and compensation properties of a mixed spin-1 and spin-3/2 Isingferrimagnet on a square lattice are investigated by standard and histogramMonte Carlo simulations. The critical temperature is studied as a function of asingle-ion anisotropy strength. The second order of the phase transition isestablished by finite-size scaling for the entire boundary. Some previouslyobtained results, such as a tricritical point, predicted by the mean fieldtheory (MFT) and effective field theory (EFT), or a first-order transition lineseparating two different ordered phases, obtained by the cluster variationaltheory (CVT), are deemed artifacts of the respective approximations. So is areentrant phenomenon produced by CVT. Nevertheless, the multicompensationbehavior predicted by MFT and EFT was confirmed.

Phase diagram of a mixed spin-1 and spin-3/2 Ising ferrimagnet