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Phase transitions in the two-dimensional random gauge XY model
- Holme, Petter (author)
- Kim, Beom Jun (author)
- Minnhagen, P. (author)
- 2003
- 2003
- English.
- In: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 67:10
- Journal article (peer-reviewed)
Abstract
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- The two-dimensional random gauge XY model, where the quenched random variables are magnetic bond angles uniformly distributed within [(-)rpi,rpi](0less than or equal torless than or equal to1), is studied via Monte Carlo simulations. We investigate the phase diagram in the plane of the temperature T and the disorder strength r and infer, in contrast to a prevailing conclusion in many earlier studies, that the system is superconducting at any disorder strength r for sufficiently low T. It is also argued that the superconducting to normal transition has different nature at weak disorder and strong disorder: termed Kosterlitz-Thouless (KT) type and non-KT type, respectively. The results are compared to earlier works.
Keyword
- vortex-glass transition
- monte-carlo
- random-superconductor
- spin-glass
- temperature
- disorder
- order
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- ref (subject category)
- art (subject category)
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