DISLOCATION CELL STRUCTURE AND ANOMALOUS CRITICAL FIELDS FOR SUPERCONDUCTIVITY IN SEVERELY DEFORMED NIOBIUM

摘要

The dependence of the anisotropy of the resistive critical field of severely deformed Nb on plastic strain and temperature, the anomalously large stress dependence, and the existence of resistive transitions in fields up to 48 kG all confirm the role of the dislocation cell wall in giving rise to criticalhyphen;field enhancement in this material.