IFLYSIB   05383
INSTITUTO DE FISICA DE LIQUIDOS Y SISTEMAS BIOLOGICOS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Multicritical Behavior in the Ising Model with Dipolar Interactions
Autor/es:
M. L. RUBIO PUZZO; C. M. HOROWITZ; M. A. BAB; G. P. SARACCO
Lugar:
Buenos Aires
Reunión:
Congreso; Fronteirs in Physical Sciences Humboldt Kolleg; 2016
Institución organizadora:
ICAS
Resumen:
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 the stripe-ordered 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 the 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 with 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.