Critical aging of a ferromagnetic system from a completely ordered stateA. A. Fedorenko and S. Trimper
Fachbereich Physik, Martin-Luther-Universität Halle-Wittenberg D-06099 Halle, Germany
received 9 December 2005; accepted in final form 3 February 2006
published online 22 February 2006
We adapt the nonlinear model to study the nonequilibrium critical dynamics of symmetric ferromagnetic system. Using the renormalization group analysis in dimensions we investigate the pure relaxation of the system starting from a completely ordered state. We find that the average magnetization obeys the long-time scaling behaviour almost immediately after the system starts to evolve while the correlation and response functions demonstrate scaling behaviour which is typical for aging phenomena. The corresponding fluctuation-dissipation ratio is computed to first order in and the relation between transverse and longitudinal fluctuations is discussed.
64.60.Ht - Dynamic critical phenomena.
05.70.Ln - Nonequilibrium and irreversible thermodynamics.
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