Monte Carlo Study of Spin-Glass Ordering on Dilute Frustrated Lattices

Results of computer simulations for a dilute Ising system on the triangle and fcc lattices are reported. Though we include only a nearest-neighbor antiferromagnetic interaction $J<0$, these systems freeze into a spin-glass for $0.50<x<1.0$ for the triangle lattice and 0.18x0.40±0.10 for the fcc lattice, where x is the concentration of magnetic spins. The spin-glass freezing is a result of the frustration inherent in the lattice and not from competition between ferromagnetic and antiferromagnetic bonds.