Normalized entropy density of the 3D 3-state Potts model

Using a multicanonical Metropolis algorithm we have performed Monte Carlo simulations of the 3D 3-state Potts model on L-3 lattices with L=20, 30, 40, 50. Covering a range of inverse temperatures from beta(min)=0 to beta(max)=0.33 we calculated the infinite volume limit of the entropy density s(beta) with its normalization obtained from s(0)=ln3. At the transition temperature the entropy and energy endpoints in the ordered and disordered phase are estimated employing a novel reweighting procedure. We also evaluate the transition temperature and the order-disorder interface tension. The latter estimate increases when capillary waves are taken into account.