Monte Carlo Simulations of Mixed Highly Frustrated Systems

We have performed Monte Carlo simulations on the mixed highly
frustrated K₂Cu_xMn_1-xF₄ and Fe_xMn_1-xTiO₃ systems. Transitions of random systems with well-established universality classes are obtained. This study allows us to investigate mainly the usual and reentrant spin glass and criticality associated to these states. The ratio x of substitution (or dilution) is found to be of great influence on the nature of this criticality.