Physics – Condensed Matter
Scientific paper
2001-02-22
J.Low.Temp.Phys. 124 (2001) 5
Physics
Condensed Matter
12 pages, 3 figures, talk given at the ULTI symposium, Pohja, Finland, 10-14 January, 2001
Scientific paper
In superconductors, and in other systems with a local U(1) gauge invariance, there are two mechanisms that form topological defects in phase transitions. In addition to the standard Kibble mechanism, thermal fluctuations of the magnetic field also lead to defect formation. This mechanism is specific to local gauge theories, predicts a qualitatively different spatial defect distribution and is the dominant source for topological defects in slow transitions. I review the arguments that lead to these conclusions and discuss possibilities of testing the scenario in superconductor experiments.
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