Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2009-08-25
Phys. Rev. B 80 (2009) 134201
Physics
Condensed Matter
Disordered Systems and Neural Networks
8+ pages, 5 figures
Scientific paper
10.1103/PhysRevB.80.134201
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.
Igloi Ferenc
Turban Loïc
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