Abstract
The Ising model on a checkerboard lattice with crossing and four-spin interactions is solved exactly when there is pure imaginary magnetic fieldH=i(π/2)kT. The model exhibits a critical point with continuously varying exponents.
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Wu, F.Y. Two-dimensional Ising model with crossing and four-spin interactions and a magnetic fieldi(π/2)kT . J Stat Phys 44, 455–463 (1986). https://doi.org/10.1007/BF01011305
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DOI: https://doi.org/10.1007/BF01011305