title: Field-driven transition in an Ising magnet with mixed interactions.
abstract: Transfer-matrix methods are used, in conjunction with finite-size scaling and conformal invariance concepts, to generate an accurate phase diagram for a two-dimensional square-lattice Ising spin-1/2 magnet, with couplings which are positive along one coordinate axis and negative along the other, in a uniform external field. Our results indicate that the critical line starts horizontally at the zero-temperature end of the phase boundary, at variance with the re-entrant behavior predicted in some earlier studies. Estimates of the thermal scaling exponent are very close to the Ising value y(T)=1 along the critical line, except near T=0 , where strong crossover effects prevent a reliable analysis.
authors.affiliation: Instituto de Física, Universidade Federal do Rio de Janeiro, Caixa Postal 68528, 21941-972 Rio de Janeiro, Brazil. sldq@if.ufrj.br
authors.forename: S L A
authors.initials: SL
authors.lastname: de Queiroz