New algorithm and results for the three-dimensional random field Ising Model

Details New algorithm and results for the three-dimensional random field Ising Model New algorithm and results for the three-dimensional random field Ising Model

2000-06-16

arxiv.org/abs/cond-mat/0006267v1

Phys. Rev. E 62, 8782-8789 (2000)

Physics

Condensed Matter

Statistical Mechanics

24 pages, 23 figures

Scientific paper

10.1103/PhysRevE.62.8782

The random field Ising model with Gaussian disorder is studied using a new Monte Carlo algorithm. The algorithm combines the advantanges of the replica exchange method and the two-replica cluster method and is much more efficient than the Metropolis algorithm for some disorder realizations. Three-dimensional sytems of size $24^3$ are studied. Each realization of disorder is simulated at a value of temperature and uniform field that is adjusted to the phase transition region for that disorder realization. Energy and magnetization distributions show large variations from one realization of disorder to another. For some realizations of disorder there are three well separated peaks in the magnetization distribution and two well separated peaks in the energy distribution suggesting a first-order transition.

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