title: Phase transitions and multicritical behavior in the Ising model with dipolar interactions.
abstract: In this work, the phase diagram of the ferromagnetic Ising model with dipole interactions is revisited with the aim of determining the nature of the phase transition between stripe-ordered phases with width n (h_{n}) and tetragonal liquid (TL) phases. Extensive Monte Carlo simulations are performed in order to study the short-time dynamic behavior of the observables for selected values of the ratio between the ferromagnetic exchange and dipolar constants δ. The obtained results indicate that the h_{1}-TL phase transition line is continuous up to δ=1.2585, while for the h_{2}-TL line a weak first-order character is found in the interval 1.2585≤δ≤1.36 and becomes continuous for 1.37≤δ≤1.9. This result suggests the existence of a tricritical point close to δ=1.37. When it is appropriate, the complete set of critical exponents is obtained, and in all the studied cases they depend on δ but do not belong to the Ising universality class. Furthermore, short-time dynamic studies reveal that at the point where the mentioned lines meet the h_{1}-h_{2} line, i.e., at δ=1.2585, the critical phase corresponding to the h_{1}-TL transition coexists with the h_{2} phase.
authors.affiliation: Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas, CONICET, Facultad de Ciencias Exactas Universidad Nacional de La Plata, Sucursal 4, CC 16(1900) La Plata, Argentina.
authors.forename: M A
authors.initials: MA
authors.lastname: Bab
authors.affiliation: Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas, CONICET, Facultad de Ciencias Exactas Universidad Nacional de La Plata, Sucursal 4, CC 16(1900) La Plata, Argentina.
authors.forename: C M
authors.initials: CM
authors.lastname: Horowitz
authors.affiliation: Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas, CONICET, Facultad de Ciencias Exactas Universidad Nacional de La Plata, Sucursal 4, CC 16(1900) La Plata, Argentina.
authors.forename: M L
authors.initials: ML
authors.lastname: Rubio Puzzo
authors.affiliation: Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas, CONICET, Facultad de Ciencias Exactas Universidad Nacional de La Plata, Sucursal 4, CC 16(1900) La Plata, Argentina.
authors.forename: G P
authors.initials: GP
authors.lastname: Saracco