Abstract
We have studied the Ising model on a layered square lattice with four different coupling constants and two different magnetic moments. The partition function at zero magnetic field is derived exactly. We propose a formula for the spontaneous magnetization which agrees with the exact low-temperature series expansion up to the 16th order and reduces to the exact result of Au-Yang and McCoy in a special case.
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Lin, K.Y., Ma, S.K. Spontaneous magnetization of the Ising model on a layered square lattice. J Stat Phys 51, 491–499 (1988). https://doi.org/10.1007/BF01028468
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DOI: https://doi.org/10.1007/BF01028468