Abstract
We have applied the technique of polarised neutron reflectometry (PNR) to investigate the magnetic field penetration in different superconducting phases of NB, namely the Meissner state ( H < H c1), the mixed state ( Hc1 < H < H c2) and the surface superconductivity state ( H c2 < H < H c3) around 4 K. The sample was a sputtered film of Nb with a 3 μm thickness on a 5 mm Si crystal substrate. The measurements were carried out on the CRISP reflectometer at the ISIS facility, with field strengths between 400 and 4500 Oe. We present preliminary data for the spin-dependent reflectivity as a function of applied field.
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