First-order transitions in defect structures at a second-order critical point for the Potts model on hierarchical lattices

Abstract
On certain hierarchical lattices the order parameter on a defect line increases discontinuously at the bulk critical temperature for q-state Potts models when q is sufficiently large, even though the bulk order parameter increases continuously. It is suggested that the same behavior may occur for two-dimensional lattices with 2<q<~4.

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