STUDY OF PHASE SEPARATION IN A FIRST-ORDER PHASE TRANSITION: NUCLEATION VERSUS SPINODAL DECOMPOSITION

H. Arkin, T. Çelik (), B. A. Berg and H. Meyer-Ortmanns
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H. Arkin: Hacettepe University, Physics Department, Ankara, Turkey
T. Çelik: Hacettepe University, Physics Department, Ankara, Turkey
B. A. Berg: Physics Dept., Florida State University, Tallahassee FL, USA
H. Meyer-Ortmanns: Fachbereich Physik, Universität Wuppertal, Germany

International Journal of Modern Physics C (IJMPC), 1999, vol. 10, issue 07, 1261-1269

Abstract: Studies of dynamical properties of first-order phase transition for a scalar field theory indicate that the phase conversion mechanism itself depends on the strength of the first-order transition: if the transition is strongly (weakly) first-order, bubble nucleation (spinodal decomposition) are favored conversion mechanisms, respectively. These distinct scenarios are of phenomenological impact. In order to see which phase conversion mechanism takes place depending on the strength of transition, we have simulated theq=5state Potts model in two dimensions with an external magnetic field. The transition gets weakened in its first-order as the external field increases. Our results indicate that the phase conversion mechanism changes from nucleation to spinodal decomposition.

Keywords: Phase separation; Potts model; Spinodal decomposition; Cluster algorithm; Bubble nucleation; Deconfinement transition (search for similar items in EconPapers)
Date: 1999
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DOI: 10.1142/S0129183199001029

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