2 research outputs found
First-order transition features of the 3D bimodal random-field Ising model
Two numerical strategies based on the Wang-Landau and Lee entropic sampling
schemes are implemented to investigate the first-order transition features of
the 3D bimodal () random-field Ising model at the strong disorder
regime. We consider simple cubic lattices with linear sizes in the range
and simulate the system for two values of the disorder strength:
and . The nature of the transition is elucidated by applying the
Lee-Kosterlitz free-energy barrier method. Our results indicate that, despite
the strong first-order-like characteristics, the transition remains continuous,
in disagreement with the early mean-field theory prediction of a tricritical
point at high values of the random-field.Comment: 19 pages, 6 figures, slightly extended version as accepted for
publicatio