Abstract
The anisotropic interfacial tension of a simple-cubic Ising model is calculated for the first time by use of extensive Monte Carlo studies with a tilted interface for a wide range of lattice size L and temperature T. The size dependence of the step free energy is used to probe the correlation length near the roughening transition and confirms the expected square-root T dependence. Finite-size scaling implies that the step free energy varies as 1/L in the rough phase, and thus the applicability of a capillary-wave Hamiltonian to describe interfaces of lattice models may be limited.
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