Partition function for two-dimensional nearest neighbour Ising model in the presence of external magnetic field
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The partition function for two-dimensional nearest neighbour Ising models in the presence of a magnetic field is derived . A comparison with the partition functions predicted by Onsager is carried out. The critical temperature estimated by two different methods yields good agreement with the result of Yang and Lee.
4 pages;one Figure; References added to the earlier version
4 pages;one Figure; References added to the earlier version