Abstract
The three dimensional ferromagnetic spin-half Ising model with an arbitrary external magnetic field is considered in the spatial continuum limit and under a certain tempering condition to be imposed on the pair-wise spin-spin interaction. An expression for the partition function has been obtained for a tempered RKKY type interaction. The solution predicts the classical mean-field behaviour above a critical temperature below which the spontaneous magnetization jumps discontinuously from zero to the saturation value.
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Kumar, N., Athreya, K.B. A three dimensional ferromagnetic Ising ‘fluid’ model. Pramana - J. Phys. 1, 98–103 (1973). https://doi.org/10.1007/BF02847183
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DOI: https://doi.org/10.1007/BF02847183