Physical realization of the generalized fully frustrated XY model in an array of SFS junctions

We show that a physical realization of the phase diagram proposed by Minnhagen et al. [Phys. Rev. B 78, 184432 (2008)] for so-called generalized fully frustrated XY model on square lattice can be achieved in arrays of SFS (superconductor-ferromagnet-superconductor) junctions near the transition of the junctions to $π$-state. Moreover, the phase diagram with such a topology has to be reproduced twice, on both sides of the $0-π$ transition.

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