Phase transitions in the two-dimensional random gauge XY model
2003 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 67, no 10Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2003. Vol. 67, no 10
vortex-glass transition, monte-carlo, random-superconductor, spin-glass, temperature, disorder, order
IdentifiersURN: urn:nbn:se:kth:diva-22397DOI: 10.1103/PhysRevB.67.104510ISI: 000182033700083OAI: oai:DiVA.org:kth-22397DiVA: diva2:341095
QC 201005252010-08-102010-08-102011-04-12Bibliographically approved