Superconductivity of Ba₂Y(Cu, Ti)₃O_y Oxide

Abstract

Samples of Ba2Y(Cu, Ti)3O y oxide were synthesized and the effect of substituting Cu with Ti was studied. In the Ba2Y(Cu3-x Ti x )O y (0≦x≦0.9), specimens were obtained which indicated a T c of over 80 K. In the composition BaαYCuβTi0.6O y (1.9≦α≦2.3, 2.3≦β≦3.5), some (Cu Ti)-rich samples indicated a T c of over 95 K which was as high as that of the existing Ba2YCu3O y . Diamagnetic signals measured by AC susceptibility at room temperature were detected in some specimens. Zero electric resistance was observed (<10-4 Ωcm at our experimental resolution) up to 300 K in the composition Ba2YCu2.4Ti0.6O y sintered at 940°C.

Nanoscale Pinning in the LRE-123 System - the Way to Applications up to Liquid Oxygen Temperature and High Magnetic Fields

“…It was found that the increasing content of TiO 2 from 1% to 5% in a flame-quench-melt-grown (FQMG) YBa 2 Cu 3 O 7−δ bulk caused a decrease of superconducting transition temperature, while in the range from 7 to 10 wt.% T c slightly recovered again (Yanmaz et al, 2002). In the YBa 2 (Cu 3-x Ti x )O y specimens, T c of about 80 K was observed for 0≤x≤0.9 (Okura et al, 1988). (Venkataramani et al, 1988).…”