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An explicit expression for the partition function of two-dimensional nearestneighbour Ising models in the presence of a magnetic field is derived by asystematic enumeration of all the spin configurations pertaining to a squarelattice of sixteen sites. The critical temperature is shown to be in excellentagreement with the reported values while the corresponding dimensionlessmagnetic field is obtained as 0.004.

Partition Function for Two-Dimensional Nearest Neighbour Ising Model in a Non-Zero Magnetic Field for a Square Lattice of 16 Sites