Partial order of frustrated Potts model

フラストレートしたPotts模型の部分秩序化

五十嵐 亮; 小形 正男*

Igarashi, Ryo; Ogata, Masao*

We investigate a 4-state ferromagnetic Potts model with a special type of geometrical frustration on a three dimensional diamond lattice. We find that the model undergoes unconventional phase transition; half of the spins in the system order in a two dimensional hexagonal-sheet-like structure while the remaining half of the spins stay disordered. The ordered sheets and the disordered sheets stack one after another. We obtain fairly large residual entropy using the Wang-Landau Monte Carlo simulation.