Volume 79, Number 5, September 2007
|Number of page(s)||6|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||01 August 2007|
Nonequilibrium critical relaxation at a first-order phase transition point
Department of Physics, Virginia Polytechnic Institute and State University - Blacksburg, VA 24061-0435, USA
2 Research Institute for Solid State Physics and Optics - H-1525 Budapest, Hungary
3 Institute of Theoretical Physics, Szeged University - H-6720 Szeged, Hungary
Accepted: 13 July 2007
We study numerically the nonequilibrium dynamical behavior of an Ising model with mixed two-spin and four-spin interactions after a sudden quench from the high-temperature phase to the first-order phase transition point. The autocorrelation function is shown to approach its limiting value, given by the magnetization in the ordered phase at the transition point, mc, through a stretched exponential decay. On the other hand relaxation of the magnetization starting with an uncorrelated initial state with magnetization, mi, approaches either mc, for , or zero, for . For small mi and for mi slightly larger than 0.5 the relaxation of the magnetization shows an asymptotic power law time dependence, thus from a nonequilibrium point of view the transition is continuous.
PACS: 64.60.Ht – Dynamic critical phenomena / 75.40.Gb – Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.) / 05.70.Fh – Phase transitions: general studies
© Europhysics Letters Association, 2007
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