Electrical and magnetic studies of YBa2Cu3O7:Y2BaCuO5 composites

✍ Scribed by W. Win; M. Wali; J.M. Obien; M.S. Bhullar; L.E. Wenger; J.T. Chen; E.M. Logothetis; R.E. Soltis; K.H. Plummer

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 873 KB
• Volume: 172
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(90)90608-h

✦ Synopsis

The superconducting and normal-state properties of YBa2Cu3OT:Y2BaCuOs composites with varying mass ratios and final sintering temperatures were investigated by using electrical resistivity and AC susceptibility techniques. By increasing the Y2BaCuO~ concentration, the normal-state resistivity of the composites changes from a metallic-like behavior to a semiconducting-like behavior. Although the onset temperature of the superconductivity was unaffected by the presence of Y2BaCuO~, the zero-resistance temperature decreased with increasing Y2BaCuOs content. Increasing the Y2BaCuO5 fraction also leads to a stronger AC magnetic field dependence, implying weaker intergranular coupling. By increasing the final sintering temperature from 900°C to 1050 ~ C, the intergranular coupling can be improved. These results indicate that the presence of insulating Y2BaCuOs does not affect the intrinsic superconducting properties of the YBa2Cu307 grains but has a strong effect on the intergranular coupling.