| Issue |
Europhys. Lett.
Volume 74, Number 1, April 2006
|
|
|---|---|---|
| Page(s) | 89 - 95 | |
| Section | Condensed matter: structural, mechanical and thermal properties | |
| DOI | https://doi.org/10.1209/epl/i2005-10500-9 | |
| 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
Received:
9
December
2005
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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