Zero-Field Susceptibility of the Two-Dimensional Ising Model nearTc

Abstract

We compute exactly the four coefficients $C_{0\pm }$ and $C_{1\pm }$ in the expansion ${\beta }^{-1\mathrm{}}\chi =C_{0\pm }{|1-\frac{T_c}{T}|}^{-\frac{7}{4}}+C_{1\pm }{|1-\frac{T_c}{T}|}^{-\frac{3}{4}}+O\left(1\right)\mathrm{}$ for the susceptibility of the rectangular two-dimensional Ising model.