Polarized-Neutron Reflections: A New Technique Used to Measure the Magnetic Field Penetration Depth in Superconducting Niobium

Abstract

An absolute determination of the superconducting penetration length in niobium has been carried out by a novel technique, in which the reflectivity of a polarized-neutron beam from a polished surface is measured. The result thus obtained, $\Lambda \mathrm{}\left(0\right)=410\mathrm{}\pm 40$ Å, is in substantial agreement with the earlier work.