Specific Heat Exponent of Random–Field ising Magnets

Zero – temperature simulations of the random–fieldIsing model (RFIM) with a bimodal distribution suggest that the specificheat's critical behaviour is consistent with an exponent . Τhisis compatible with experimental measurements on random – field anddiluted – antiferromagnetic systems and, together with previoussimulations on the Gaussian RFIM, settles a clear picture for thecurrently controversial issue of the value of the criticalexponent α in the random–field problem.