VORTEX LATTICES IN STRONG TYPE-II SUPERCONDUCTING 2-DIMENSIONAL STRIPS

We show how to calculate semianalytically the dense vortex state in st rong type-II superconducting nanostructures. For the specific case of a strip, we find vortex lattice solutions that also incorporate surfac e superconductivity. We calculate the energy cost to displace individu al vortex rows parallel to the surfaces and find that this energy osci llates with the magnetic held. Remarkably, we also find that, at a cri tical field H below H-c2, this ''shear'' energy becomes strictly zero for the surface rows due to an unexpected mismatch with the bulk latt ice. [S0163-1829(98)00718-8].