Dissociation of vortex stacks into fractional-flux vortices

Details Dissociation of vortex stacks into fractional-flux vortices Dissociation of vortex stacks into fractional-flux vortices

2004-08-28

arxiv.org/abs/cond-mat/0408633v2

Phys. Rev. Lett. 94, 097001 (2005)

Physics

Condensed Matter

Superconductivity

4 pages, 1 figure; revised version, to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.94.097001

We discuss the zero field superconducting phase transition in a finite system of magnetically coupled superconducting layers. Transverse screening is modified by the presence of other layers resulting in topological excitations with fractional flux. Vortex stacks trapping a full flux and present at any finite temperature undergo an evaporation transition which corresponds to the depairing of fractional-flux vortices in individual layers. We propose an experiment with a bi-layer system allowing us to identify the dissociation of bound vortex molecules.

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