Magneto-optical studies of flux penetration in super-hard Nb wire

  title={Magneto-optical studies of flux penetration in super-hard Nb wire},
  author={David Paul Young and Monica Moldovan and Philip W. Adams and Ruslan Prozorov},
We present a study of the magnetic response of type-II superconductivity in the extreme pinning limit, where screening currents within an order of magnitude of the Ginzburg–Landau depairing critical current density develop upon the application of a magnetic field. We show that this 'super-hard' limit is realized in highly disordered, cold drawn, Nb wire whose magnetization response is characterized by a cascade of Meissner-like phases, each terminated by a catastrophic collapse of the… CONTINUE READING