Screened Vortex Lattice Model with Disorder

Details Screened Vortex Lattice Model with Disorder Screened Vortex Lattice Model with Disorder

2002-02-26

arxiv.org/abs/cond-mat/0202487v2

Physics

Condensed Matter

Statistical Mechanics

Extensively revised; 4 pages, 4 figures, Submitted to PRL

Scientific paper

The three dimensional XY model with quenched random disorder and finite screening is studied. We argue that the system scales to model with $\lambda\simeq 0\simeq T$ 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 $\theta\simeq +1.0$ for weak disorder. For low magnetic field and weak disorder, there is also a superconducting phase with $\theta\simeq +1.0$ which we conjecture is a Bragg glass. For larger disorder or applied field, there is a non superconducting phase with $\theta\simeq -1.0$. We estimate the critical external field whose value is consistent with experiment.

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