The Coulomb-Higgs phase transition in Z(8) and q=8 U(1)-Higgs models
L. A. Fernandez, A. Munoz Sudupe, J. J. Ruiz-Lorenzo, A. Tarancon
Abstract
The Coulomb-Higgs phase transition of the four dimensional Z8 gauge model is studied. We find clear first order properties in contradiction with the previously stressed second order behavior. That transition point may be regarded as the end of a transition line of the U(1)-Higgs model with charge q=8, that has been also assumed of second order. We show that this line is first order in a wide region, with a decreasing latent heat that goes to zero when closing to the 4--d XY model limit.
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