https://doi.org/10.1140/epjb/e2008-00035-y
Phase transitions induced by thermal fluctuations
1
Applied Physics Institute, 58, Petropavlovskaya St., 40030 Sumy, Ukraine
2
Sumy State University, 2, Rimskii-Korsakov St., 40007 Sumy, Ukraine
Corresponding author: a dikh@ipfcentr.sumy.ua
Received:
11
May
2007
Revised:
24
September
2007
Published online:
23
January
2008
The present study generalizes the model of extended stochastic systems with a field-dependent kinetic coefficient [M. Ibanes, J. Garcia-Ojalvo, R. Toral, J.M. Sancho, Phys. Rev. Lett. 87, 020601 (2001)] to systems with symmetric and asymmetric bistable potentials. It is found that in systems with a relaxational flow and a symmetric local potential, reentrant phase transitions can be observed. In the case of an asymmetric local potential, a hysteresis-like behaviour in the order parameter appears. It is shown that such phase transitions can be controlled by the constant that governs relaxation flow, noise intensity and spatial coupling intensity.
PACS: 05.40.-a – Fluctuation phenomena, random processes, noise, and Brownian motion / 05.10.Gg – Stochastic analysis methods (Fokker-Planck, Langevin, etc.) / 64.60.-i – General studies of phase transitions
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2008
