Abstract
The two-dimensional axial next-nearest neighbour Ising (ANNNI) model is studied for the first time by a transfer matrix method for semi-infinite strips (N×∞;N≦13). One obtains the thermodynamic properties and, more important, the correlation functions, which display directly the various magnetic structures. In one part of the phase diagram where a disorder line is believed to follow closely the ferromagnetic transition line the critical exponents appear to deviate from the expected ones. ForN≧13 a variational procedure is proposed.
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Pesch, W., Kroemer, J. Transfer matrix analysis of the two-dimensional ANNNI model. Z. Physik B - Condensed Matter 59, 317–323 (1985). https://doi.org/10.1007/BF01307437
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DOI: https://doi.org/10.1007/BF01307437