Phase transitions in the two-dimensional random gauge XY model | |
Article | |
关键词: VORTEX-GLASS TRANSITION; MONTE-CARLO; RANDOM-SUPERCONDUCTOR; SPIN-GLASS; TEMPERATURE; DISORDER; ORDER; | |
DOI : 10.1103/PhysRevB.67.104510 | |
来源: SCIE |
【 摘 要 】
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.
【 授权许可】
Free