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

TL;DR

This study uses Monte Carlo simulations to analyze the phase diagram and critical properties of a mixed spin-1 and spin-3/2 Ising ferrimagnet on a square lattice, clarifying previous theoretical predictions.

Contribution

It provides a detailed Monte Carlo analysis of the phase diagram, confirming some predictions and refuting others from mean field and effective field theories.

Findings

Critical temperature depends on single-ion anisotropy.

Second order phase transition confirmed by finite-size scaling.

Reentrant phenomena and some multicompensation behaviors are clarified.

Abstract

Critical and compensation properties of a mixed spin-1 and spin-3/2 Ising ferrimagnet on a square lattice are investigated by standard and histogram Monte Carlo simulations. The critical temperature is studied as a function of a single-ion anisotropy strength. The second order of the phase transition is established by finite-size scaling for the entire boundary. Some previously obtained results, such as a tricritical point, predicted by the mean field theory (MFT) and effective field theory (EFT), or a first-order transition line separating two different ordered phases, obtained by the cluster variational theory (CVT), are deemed artifacts of the respective approximations. So is a reentrant phenomenon produced by CVT. Nevertheless, the multicompensation behavior predicted by MFT and EFT was confirmed.