Superconducting film with randomly magnetized dots: A realization of the 2D XY model with random phase shifts

Details Superconducting film with randomly magnetized dots: A realization of the 2D XY model with random phase shifts Superconducting film with randomly magnetized dots: A realization of the 2D XY model with random phase shifts

2009-03-31

arxiv.org/abs/0903.5514v2

Phys. Rev. B 80, 174528 (2009)

Physics

Condensed Matter

Superconductivity

5 pages, 1 figure

Scientific paper

10.1103/PhysRevB.80.174528

We consider a thin superconducting film with randomly magnetized dots on top of it. The dots produce a disordered pinning potential for vortices in the film. We show that for dots with permanent and random magnetization normal or parallel to the film surface, our system is an experimental realization of the two-dimensional XY model with random phase shifts. The low-temperature superconducting phase, that exists without magnetic dots, survives in the presence of magnetic dots for sufficiently small disorder.

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