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    [19] Frustration in two dimensions: phase transition for a Potts-XY model
    D. Loison, submitted to Euro. J. Phys. B
    We consider a Potts-$XY$ model in two dimensions as a generalization of the Ising-$XY$ model which described the Josephson-junction array under a magnetic field. We show that the transition is of first order and thus exclude for the present model the presence of a huge screening effect as it was emphasized in the Ising-$XY$ case. We give some arguments that this conclusion holds for the latter case.
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