Stable vortex-antivortex molecules in mesoscopic superconducting   triangles
  A thermodynamically stable vortex-antivortex pattern has been revealed in mesoscopic type I superconducting triangles, contrary to type II superconductors where similar patterns are unstable. The stable vortex-antivortex "molecule" appears due to the interplay between two factors: a repulsive vortex-antivortex interaction in type I superconductors and the vortex confinement in the triangle. 
V. R. Misko (1), V. M. Fomin (1), J. T. Devreese (1), V. V.   Moshchalkov (2) ((1) TFVS, Universiteit Antwerpen - UIA, (2) V...