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, $\ensuremath{\Lambda}(0)=410\ifmmode\pm\else\textpm\fi{}40$ \AA{}, is in substantial agreement with the earlier work.