Influence of technological conditions on the superconducting properties of yttrium based rods

10.1007/s11455-008-1002-1

“…A significant difference in the critical current density of epitaxial films and bulk materials is commonly related to the presence of defects between crystal blocks in YBCO rods. It was previously demon-strated [6] that the crystallization of YBCO in a vertical tubular furnace with certain axial and radial temperature gradients modifies the current-voltage ( I -U ) characteristics of rods. This result was explained by the elimination of pores and nonsuperconducting phases from the rod volume in the course of melting and solidification.…”