Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2008-09-15
J. Stat. Mech. (2008) P11009
Physics
Condensed Matter
Statistical Mechanics
19 pages, 5 figures, final version
Scientific paper
10.1088/1742-5468/2008/11/P11009
We investigate and contrast, via entropic sampling based on the Wang-Landau algorithm, the effects of quenched bond randomness on the critical behavior of two Ising spin models in 2D. The random bond version of the superantiferromagnetic (SAF) square model with nearest- and next-nearest-neighbor competing interactions and the corresponding version of the simple Ising model are studied and their general universality aspects are inspected by a detailed finite-size scaling (FSS) analysis. We find that, the random bond SAF model obeys weak universality, hyperscaling, and exhibits a strong saturating behavior of the specific heat due to the competing nature of interactions. On the other hand, for the random Ising model we encounter some difficulties for a definite discrimination between the two well-known scenarios of the logarithmic corrections versus the weak universality. Yet, a careful FSS analysis of our data favors the field-theoretically predicted logarithmic corrections.
Fytas Nikolaos G.
Hadjiagapiou I. A.
Malakis Anastasios
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