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】

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