Partition function for two-dimensional nearest neighbour Ising model in the presence of external magnetic field
arXiv:0706.3643
Abstract
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