Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2004-01-18
Phys. Rev. E 70, 021101 (2004)
Physics
Condensed Matter
Statistical Mechanics
7 pages, 4 figures; Final version to appear in Phys. Rev. E; Section V has been revised
Scientific paper
10.1103/PhysRevE.70.021101
The metastable behavior of a kinetic Ising--like ferromagnetic model system in which a generic type of microscopic disorder induces nonequilibrium steady states is studied by computer simulation and a mean--field approach. We pay attention, in particular, to the spinodal curve or intrinsic coercive field that separates the metastable region from the unstable one. We find that, under strong nonequilibrium conditions, this exhibits reentrant behavior as a function of temperature. That is, metastability does not happen in this regime for both low and high temperatures, but instead emerges for intermediate temperature, as a consequence of the non-linear interplay between thermal and nonequilibrium fluctuations. We argue that this behavior, which is in contrast with equilibrium phenomenology and could occur in actual impure specimens, might be related to the presence of an effective multiplicative noise in the system.
Garrido Pedro L.
Hurtado Pablo I.
Marro Joaquin
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