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Article overview
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Universality in Three Dimensional Random-Field Ground States | | A.K. Hartmann
; U. Nowak
; | | Date: |
9 Jul 1998 | | Journal: | Eur. Phys. J. B 7, 105 (1999) | | Subject: | Statistical Mechanics | cond-mat.stat-mech | | Abstract: | We investigate the critical behavior of three-dimensional random-field Ising systems with both Gauss and bimodal distribution of random fields and additional the three-dimensional diluted Ising antiferromagnet in an external field. These models are expected to be in the same universality class. We use exact ground-state calculations with an integer optimization algorithm and by a finite-size scaling analysis we calculate the critical exponents nu, beta, and gamma-bar. While the random-field model with Gauss distribution of random fields and the diluted antiferromagnet appear to be in same universality class, the critical exponents of the random-field model with bimodal distribution of random fields seem to be significantly different. | | Source: | arXiv, cond-mat/9807131 | | Services: | Forum | Review | PDF | Favorites | |
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