2002/02/26 by C. Giardina', Giardina', C., N. V. Priezjev +3
Physics and Astronomy · #FOS: Physical sciences #Statistical Mechanics (cond-mat.stat-mech) #Superconductivity (cond-mat.supr-con) #cond-mat.stat-mech #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.cond-mat/0202487
Extensively revised; 4 pages, 4 figures, Submitted to PRL
arxiv created 2002/09/04 · arxiv updated 2009/11/30
The three dimensional XY model with quenched random disorder and finite screening is studied. We argue that the system scales to model with λ≃ 0≃ T and the resulting effective model is studied numerically by defect energy scaling. In zero external field we find that there exists a true superconducting phase with a stiffness exponent θ≃ +1.0 for weak disorder. For low magnetic field and weak disorder, there is also a superconducting phase with θ≃ +1.0 which we conjecture is a Bragg glass. For larger disorder or applied field, there is a non superconducting phase with θ≃ -1.0. We estimate the critical external field whose value is consistent with experiment.