Crossovers in the two-dimensional Ising spin glass with ferromagnetic next-nearest-neighbour interactions

By means of extensive computer simulations we analyse in detail the two- dimensionalJ Ising spin glass with ferromagnetic next-nearest-neighbour interactions. We found a crossover from ferromagnetic to 'spin glass'-like order both from numerical simulations and analytical arguments. We also present proof of a second crossover from the 'spin glass' behaviour to a paramagnetic phase for the largest volume studied.

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