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 , , and . 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.
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Received: 9 July 1998 / Received in final form: 15 July 1998 / Accepted: 20 July 1998
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Hartmann, A., Nowak, U. Universality in three dimensional random-field ground states. Eur. Phys. J. B 7, 105–109 (1999). https://doi.org/10.1007/s100510050593
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DOI: https://doi.org/10.1007/s100510050593