IFLYSIB   05383
INSTITUTO DE FISICA DE LIQUIDOS Y SISTEMAS BIOLOGICOS
Unidad Ejecutora - UE
artículos
Título:
Phase Transitions and Multicritical Behavior of the Ising Model with Dipolar Interactions
Autor/es:
C. M. HOROWITZ; BAB, MARISA ALEJANDRA; G. P. SARACCO; BAB, MARISA ALEJANDRA; G. P. SARACCO; M. L. RUBIO PUZZO; M. L. RUBIO PUZZO; C. M. HOROWITZ
Revista:
PHYSICAL REVIEW E
Editorial:
AMER PHYSICAL SOC
Referencias:
Lugar: New York; Año: 2016 vol. 94 p. 421041 - 421048
ISSN:
1539-3755
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 stripe-ordered phases with width n (hn ) 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 h1-TL phase transition line is continuous up to δ = 1.2585, while for the h2 -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 h1-h2 line, i.e., at δ = 1.2585, the critical phase corresponding to the h1 -TL transition coexists with the h2 phase.