Symmetric and non-symmetric vortex-antivortex molecules in fourfold superconducting geometry

Details Symmetric and non-symmetric vortex-antivortex molecules in fourfold superconducting geometry Symmetric and non-symmetric vortex-antivortex molecules in fourfold superconducting geometry

2008-10-24

arxiv.org/abs/0810.4415v1

Phys. Rev. Lett. 97, 137002 (2006)

Physics

Condensed Matter

Superconductivity

5 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.97.137002

In submicron superconducting squares in a homogeneous magnetic field, Ginzburg-Landau theory may admit solutions of the vortex-antivortex type, conforming with the symmetry of the sample [Chibotaru et al., Nature 408, 833 (2000)]. Here we show that these fascinating, but never experimentally observed states, can be enforced by artificial fourfold pinning, with their diagnostic features enhanced by orders of magnitude. The second-order nucleation of vortex-antivortex molecules can be driven either by temperature or applied magnetic field, with stable asymmetric vortex-antivortex equilibria found on its path.

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