Morphology of the Superconducting Vortex Lattice in Ultra-Pure Niobium

Details Morphology of the Superconducting Vortex Lattice in Ultra-Pure Niobium Morphology of the Superconducting Vortex Lattice in Ultra-Pure Niobium

2009-02-20

arxiv.org/abs/0902.3575v1

Physics

Condensed Matter

Superconductivity

Accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.102.136408

The morphology of the superconducting flux line lattice (FLL) of Nb comprises gradual variations with various lock-in transitions and symmetry breaking rotations. We report a comprehensive small-angle neutron scattering study of the FLL in an ultra-pure single crystal of Nb as a function of the orientation of the applied magnetic field. We attribute the general morphology of the FLL and its orientation to three dominant mechanisms. First, non-local contributions, second, the transition between open and closed Fermi surface sheets and, third, the intermediate mixed state between the Meissner and the Shubnikov phase.

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