Volume 74, Number 1, April 2006
|Page(s)||89 - 95|
|Section||Condensed matter: structural, mechanical and thermal properties|
|Published online||22 February 2006|
Critical aging of a ferromagnetic system from a completely ordered state
Fachbereich Physik, Martin-Luther-Universität Halle-Wittenberg D-06099 Halle, Germany
Accepted: 3 February 2006
We adapt the nonlinear σ 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 ε and the relation between transverse and longitudinal fluctuations is discussed.
PACS: 64.60.Ht – Dynamic critical phenomena / 05.70.Ln – Nonequilibrium and irreversible thermodynamics
© EDP Sciences, 2006
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