title: Anisotropy and universality in finite-size scaling: critical Binder cumulant of a two-dimensional Ising model.
abstract: We reanalyze transfer-matrix and Monte Carlo results for the critical Binder cumulant U* of an anisotropic two-dimensional Ising model on a square lattice in a square geometry with periodic boundary conditions. Spins are coupled between nearest-neighboring sites and between next-nearest-neighboring sites along one of the lattice diagonals. We find that U* depends only on the asymptotic critical long-distance features of the anisotropy, irrespective of its realization through ferromagnetic or antiferromagnetic next-nearest-neighbor couplings. We modify an earlier renormalization-group calculation to obtain a quantitative description of the anisotropy dependence of U*. Our results support our recent claim towards the validity of universal finite-size scaling for critical phenomena in the presence of a weak anisotropy.
authors.affiliation: Institute for Materials Science, Technische Universität Darmstadt, D-64287 Darmstadt, Germany. bkastening@matgeo.tu-darmstadt.de
authors.forename: Boris
authors.initials: B
authors.lastname: Kastening