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Using Molecular Dynamics (MD) and Monte Carlo (MC) simulations interfacialproperties of crystal-fluid interfaces are investigated for the hard spheresystem and the one-component metallic system Ni (the latter modeled by apotential of the embedded atom type). Different local order parameters areconsidered to obtain order parameter profiles for systems where the crystalphase is in coexistence with the fluid phase, separated by interfaces with(100) orientation of the crystal. From these profiles, the mean-squaredinterfacial width w^2 is extracted as a function of system size. We rationalizethe prediction of capillary wave theory that w^2 diverges logarithmically withthe lateral size of the system. We show that one can estimate the interfacialstiffness from the interfacial broadening, obtaining 0.5 k_B T/sigma^2 for hardspheres and 0.18 J/m^2 for Ni.

Computer simulation studies of finite-size broadening of solid-liquid interfaces: From hard spheres to nickel