Critical Ising lines of the d=2 Ashkin-Teller model
G. Kamieniarz, Piotr Kozłowski, Raf Dekeyser
The universal critical point ratio Q is exploited to determine positions of the critical Ising transition lines on the phase diagram of the Ashkin-Teller model on the square lattice. A leading-order expansion of the ratio Q in the presence of a nonvanishing thermal field is found from finite-size scaling and the corresponding expression is fitted by the accurate perturbative transfer-matrix data calculations for the L\ifmmode\times\else\texttimes\fi{}L square clusters with L\ensuremath{\leqslant}9.
arXiv:cond-mat/9803277•Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics•Mar 1, 1997•19 citations