Superconducting properties of melt processed LRE-Ba-Cu-O

摘要

Unlike YBa_2Cu_3O_y (Y123) system the LRE123 systems (LRE: light rare earth elements: La, Nd, Sm, Eu, Gd) have a LRE_(1+x)Ba_(2-x)Cu_3O_y type solid solution, that is, LRE can substitute on Ba site [1]. The range of x depends on the kind of LRE. Due to the presence of LRE-Ba substitution, these LRE-Ba-Cu-O superconductors exhibit low T_c, which can be explained in terms of a decrease in the carrier concentration when LRE with 3+ valence substitutes for Ba with 2+ valence.