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 0.18x0.400.10 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. © 1979 The American Physical Society.