Boundary and Bulk Phase Transitions in the Two Dimensional Q > 4 State   Potts Model
  The surface and bulk properties of the two-dimensional Q > 4 state Potts model in the vicinity of the first order bulk transition point have been studied by exact calculations and by density matrix renormalization group techniques. For the surface transition the complete analytical solution of the problem is presented in the $Q \to \infty$ limit, including the critical and tricritical exponents, magnetization profiles and scaling functions. According to the accurate numerical results the universality class of the surface transition is independent of the value of Q > 4. For the bulk transition we have numerically calculated the latent heat and the magnetization discontinuity and we have shown that the correlation lengths in the ordered and in the disordered phases are identical at the transition point. 
Ferenc Igloi (1,2) and Enrico Carlon (3) ((1) Research Institute for   Solid State Physics, Budapest (2) University of Szege...