Spin glass transition in AuFe, CuMn, AuMn, AgMn and AuCr systems

Abstract The Monte Carlo method was applied to the study of some metallic magnetic alloys which display spin glass behavior. The energies of the alloys are modelled considering the RKKY interaction among the magnetic moments, and the range of the interaction is controlled by introducing a cutoff radius. In the case of very diluted spin glasses (SG), the spin glass transition is only clearly found when distant next neighbors are considered. In that case of very diluted alloys, the Edward-Anderson order parameter shows that first and second neighbor Heisenberg-like Hamiltonians would not present a SG phase transition. The occurrence of the spin-glass condition is due to the RKKY long-range interaction. The presented Monte Carlo results allows a semi-quantitative prediction of the spin glass freezing temperature.