Determining the vortex tilt relative to a superconductor surface
  It is of interest to determine the exit angle of a vortex from a
superconducting surface, since this affects the intervortex interactions and
their consequences. Two ways to determine this angle are to image the vortex
magnetic fields above the surface, or the vortex core shape at the surface. In
this work we evaluate the field h(x, y, z) above a flat superconducting surface
x, y and the currents J(x,y) at that surface for a straight vortex tilted
relative to the normal to the surface, for both the isotropic and anisotropic
cases. In principle, these results can be used to determine the vortex exit
tilt angle from analyses of magnetic field imaging or density of states data.
