Super-Aging in two-dimensional random ferromagnets
Abstract
We study the aging properties, in particular the two-time autocorrelations, of the two-dimensional randomly diluted Ising ferromagnet below the critical temperature via Monte-Carlo simulations. We find that the autocorrelation function displays additive aging C(t,tw)=Cst(t)+Cag(t,tw), where the stationary part Cst decays algebraically. The aging part shows anomalous scaling Cag(t,tw)= C(h(t)/h(tw)), where h(u) is a non-homogeneous function excluding a t/tw scaling.
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