Kabakçıoğlu, A.Berker, A. N.Yalabık, M. C.2016-02-082016-02-0819941063-651Xhttp://hdl.handle.net/11693/25989Closed-form solutions of the hard-spin mean-field theory equations for the antiferromagnetic Ising model on a triangular lattice, with or without an external field H, are obtained, showing the lack of order for H=0 and very good agreement with Monte Carlo data for the onset of order for nonzero H. A free energy calculation is developed, within the context of hard-spin mean-field theory, distinguishing between metastable solutions and true thermodynamic equilibrium. © 1994 The American Physical Society.EnglishArticle10.1103/PhysRevE.49.2680