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Universality aspects of the d=3 random-bond Blume-Capel model

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Malakis, A. and Berker, A. Nihat and Fytas, N. G. and Papakonstantinou, T. (2012) Universality aspects of the d=3 random-bond Blume-Capel model. Physical Review E, 85 (issue 6 part 1). ISSN 1539-3755

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Official URL: http://dx.doi.org/10.1103/PhysRevE.85.061106

Abstract

The effects of bond randomness on the universality aspects of the simple cubic lattice ferromagnetic Blume-Capel model are discussed. The system is studied numerically in both its first- and second-order phase transition regimes by a comprehensive finite-size scaling analysis. We find that our data for the second-order phase transition, emerging under random bonds from the second-order regime of the pure model, are compatible with the universality class of the 3d random Ising model. Furthermore, we find evidence that the second-order transition emerging under bond randomness from the first-order regime of the pure model belongs to a new and distinctive universality class. The first finding reinforces the scenario of a single universality class for the 3d Ising model with the three well-known types of quenched uncorrelated disorder (bond randomness, site and bond dilution). The second amounts to a strong violation of the universality principle of critical phenomena. For this case of the ex-first-order 3d Blume-Capel model, we find sharp differences from the critical behaviors, emerging under randomness, in the cases of the ex-first-order transitions of the corresponding weak and strong first-order transitions in the 3d three-state and four-state Potts models.

Item Type:Article
Additional Information:Article Number: 061106
Subjects:Q Science > QC Physics
ID Code:19145
Deposited By:A. Nihat Berker
Deposited On:04 Jul 2012 15:28
Last Modified:31 Jul 2019 11:07

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