Wang-Landau study of the 3D Ising model with bond disorder

• Main Authors: Theodorakis, P. E, Fytas, N. G
• Format: Journal Article
• Language: English
• Published: 18-04-2011
• Subjects: Physics - Statistical Mechanics
• DOI: 10.48550/arxiv.1104.3524

Eur. Phys. J. B 81, 245-251 (2011) We implement a two-stage approach of the Wang-Landau algorithm to investigate
the critical properties of the 3D Ising model with quenched bond randomness. In
particular, we consider the case where disorder couples to the nearest-neighbor
ferromagnetic interaction, in terms of a bimodal distribution of strong versus
weak bonds. Our simulations are carried out for large ensembles of disorder
realizations and lattices with linear sizes $L$ in the range $L=8-64$. We apply
well-established finite-size scaling techniques and concepts from the scaling
theory of disordered systems to describe the nature of the phase transition of
the disordered model, departing gradually from the fixed point of the pure
system. Our analysis (based on the determination of the critical exponents)
shows that the 3D random-bond Ising model belongs to the same universality
class with the site- and bond-dilution models, providing a single universality
class for the 3D Ising model with these three types of quenched uncorrelated
disorder.