Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2012-02-07
Phys. Rev. E 85, 021141 (2012)
Physics
Condensed Matter
Disordered Systems and Neural Networks
To be published in Physical Review E
Scientific paper
10.1103/PhysRevE.85.021141
We study the nonconserved phase ordering dynamics of the d = 2, 3 random field Ising model, quenched to below the critical temperature. Motivated by the puzzling results of previous work in two and three di- mensions, reporting a crossover from power-law to logarithmic growth, together with superuniversal behavior of the correlation function, we have undertaken a careful investigation of both the domain growth law and the autocorrelation function. Our main results are as follows: We confirm the crossover to asymptotic logarithmic behavior in the growth law, but, at variance with previous findings, the exponent in the preasymptotic power law is disorder-dependent, rather than being the one of the pure system. Furthermore, we find that the autocorre- lation function does not display superuniversal behavior. This restores consistency with previous results for the d = 1 system, and fits nicely into the unifying scaling scheme we have recently proposed in the study of the random bond Ising model.
Corberi Federico
Lippiello Eugenio
Mukherjee Antara
Puri Sanjay
Zannetti Marco
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