Extended defects in the H-reduced YBa2Cu3O7

Abstract

By exposure of YBa₂Cu₃O₇ to hydrogen at moderate temperatures, the superconductivity properties, T_c and Meissner volume fraction, are, depending on the treatment conditions, differently affected. Although no major changes are detected by X-ray diffraction, the microstructure of the obtained products is quite complex, and a significant amount of disorder is produced. The results are also compared with those produced in the reduction performed with n-butyllithium.