Computer simulation of vortex formation during domain growth
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We have studied the finite-temperature domain-growth kinetics in two-dimensional models with high ground-state degeneracy and non-conserved order parameter by means of Monte Carlo temperature-quenching techniques. The models are Q-state Potts models with anisotropic pair potential which at low temperatures are found to develop vortex structures during the non-equilibrium domain-growth process. The vortex formation is an entropy-driven effect in this model. We have identified vortex-antivortex pairs as a significant structural element of the temporal domain-boundary morphology and shown that the vortices and anti-vortices annihilate during the growth process without pinning the ordering process. The resulting growth law as derived from the excess domain-wall energy and the vortex density is found to be the Lifshitz-Allen-Cahn law with the classical exponent value, n = ½, independent of the ordering degeneracy Q.
Originalsprog | Engelsk |
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Tidsskrift | Physica Scripta |
Vol/bind | T33 |
Sider (fra-til) | 180-184 |
Antal sider | 5 |
ISSN | 0031-8949 |
DOI | |
Status | Udgivet - 1990 |
ID: 236893854