A first-order phase transition is found in two types of intrinsic curvature models defined on dynamically triangulated surfaces of disk topology. The intrinsic curvature energy is included in the Hamiltonian. The smooth phase is separated from a non-smooth phase by the transition. The crumpled phase, which is different from the non-smooth phase, also appears at sufficiently small curvature coefficient α. The phase structure of the model on the disk is identical to that of the spherical surface model, which was investigated by us and reported previously. Thus, we found that the phase structure of the fluid surface model with intrinsic curvature is independent of whether the surface is closed or open. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 200664.60.-i General studies of phase transitions, 68.60.-p Physical properties of thin films, nonelectronic, 87.16.Dg Membranes, bilayers, and vesicles,
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