Physical review. B, Condensed matter
Zero-field susceptibility of the antiferromagnetic square Ising lattice
Stuart S. C. Burnett, S. Gartenhaus
Abstract
The first two terms in the expansion near ${\mathit{T}}_{\mathit{C}}$ of the zero-field susceptibility of the antiferromagnetic square Ising lattice are known exactly. We have isolated the next four terms in this expansion by carrying out a differential-approximant analysis of Nickel's 55-term high-temperature ferromagnetic series with the variable v=tanhJ/${\mathit{k}}_{\mathit{B}}$T replaced by -v. The four new terms are found to vary as t, ${\mathit{t}}^{2}$ln\ensuremath{\Vert}t\ensuremath{\Vert}, ${\mathit{t}}^{2}$, and ${\mathit{t}}^{3}$ln\ensuremath{\Vert}t\ensuremath{\Vert} where t=1-${\mathit{T}}_{\mathit{C}}$/T and values for their respective coefficients are obtained. It is established that to order ${\mathit{t}}^{3}$ln\ensuremath{\Vert}t\ensuremath{\Vert}, there are no confluent singularities associated with irrelevant variables for this system. A direct extrapolation of Nickel's series coefficients is also carried out and found to be consistent with the present results.