Abstract
The interface delocalization in the three-dimensional Ising model is studied by real-space renormalization group methods. The first-order cumulant expansion approximation is used. Defect free energies for a boundary plane of defects and an internal plane of defects are calculated in the whole temperature region. The phase diagrams are also obtained. The method and the model analyzed may give a correct phase diagram only in the regime of continuous interface delocalization. The interface delocalization is obtained for the boundary defect and also for the internal defect if the systems on two sides of the internal defect plane have a different degree of order. The delocalization transition does not occur in the case of the internal defect plane between two equally ordered systems.
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Bilalbegović, G. Interface delocalization in the three-dimensional Ising model. J Stat Phys 50, 1131–1140 (1988). https://doi.org/10.1007/BF01019157
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DOI: https://doi.org/10.1007/BF01019157