Disordered Potts model on the diamond hierarchical lattice: Numerically exact treatment in the large-q limit

Abstract

We consider the critical behavior of the random q-state Potts model in the large-q limit with different types of disorder leading to either the nonfrustrated random ferromagnet regime or the frustrated spin glass regime. The model is studied on the diamond hierarchical lattice for which the Migdal-Kadanoff real-space renormalization is exact. It is shown to have a ferromagnetic and a paramagnetic phase and the phase transition is controlled by four different fixed points. The state of the system is characterized by the distribution of the interface free energy P(I) which is shown to satisfy different integral equations at the fixed points. By numerical integration we have obtained the corresponding stable laws of nonlinear combination of random numbers and obtained numerically exact values for the critical exponents.

8+ pages, 5 figures

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• Spin Wave Excitations in AFe${}_{1.5}$Se${}_2$ (A=K, Tl): Analytical Study
• Random site dilution properties of frustrated magnets on a hierarchical lattice
• Dynamical barriers of pure and random ferromagnetic Ising models on fractal lattices
• Locally self-similar phase diagram of the disordered Potts model on the hierarchical lattice