Qualitative aspects of the phase diagram of J1-J2 model on the cubic lattice

Abstract

The qualitative aspects of the phase diagram of the Ising model on the cubic lattice, with ferromagnetic nearest-neighbor interactions ($J_1$) and antiferromagnetic next-nearest-neighbor couplings ($J_2$) are analyzed in the plane temperature versus $\alpha$, where $\alpha =J_2/|J_1|$ is the frustration parameter. We used the original Wang-Landau sampling and the standard Metropolis algorithm to confront past results of this model obtained by the effective-field theory (EFT) for the cubic lattice. Our numerical results suggest that the predictions of the EFT are in general qualitatively correct, but the low-temperature reentrant behavior, observed in the frontier separating the ferromagnetic and the colinear order, is an artifact of the EFT approach and should disappear when we consider Monte Carlo simulations of the model. In addition, our results indicate that the continuous phase transition between the Ferromagnetic and the Paramagnetic phases, that occurs for $0.0\le \alpha <0.25$, belongs to the universality class of the three-dimensional pure Ising Model.

16 pages, 11 figures, to appear in IJMPB

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Cited by in corpus (1)

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