Zero-temperature Hysteresis in Random-field Ising Model on a Bethe Lattice

Details Zero-temperature Hysteresis in Random-field Ising Model on a Bethe Lattice Zero-temperature Hysteresis in Random-field Ising Model on a Bethe Lattice

1996-11-05

arxiv.org/abs/cond-mat/9611028v2

J. Phys. A30 (1997) 5259.

Physics

Condensed Matter

Statistical Mechanics

latex file with 5 eps figures. This version is substantially revised with new material. Submitted to J. Phys. A

Scientific paper

10.1088/0305-4470/30/15/013

We consider the single-spin-flip dynamics of the random-field Ising model on a Bethe lattice at zero temperature in the presence of a uniform external field. We determine the average magnetization as the external field is varied from minus infinity to plus infinity by setting up the self-consistent field equations, which we show are exact in this case. We find that for a 3-coordinated Bethe lattice, there is no jump discontinuity in magnetization for arbitrarily small gaussian disorder, but the discontinuity is present for larger coordination numbers. We have checked our results by Monte Carlo simulations employing a technique for simulating classical interacting systems on the Bethe lattice which avoids surface effects altogether.

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