Stable fractional flux vortices in mesoscopic superconductors

Details Stable fractional flux vortices in mesoscopic superconductors Stable fractional flux vortices in mesoscopic superconductors

2009-12-21

arxiv.org/abs/0912.4125v1

Physical Review B 81, 020502(R) (2010)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures, to be published in Physical Review B

Scientific paper

10.1103/PhysRevB.81.020502

Conventional superconductors have vortices carrying integer multiples of magnetic flux quantum while unconventional ones, with p- or d-wave order parameter, allow half-integer fluxes. Here we show that mesoscopic size effects stabilize fractional flux vortices in the thermodynamical ground state of s-wave two-gap superconductors. The value of these fluxes can be an arbitrary fraction of flux quantum and can be measured directly from distributions of magnetic fields on the samples.

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