Dissipation in granular high-temperature superconductors

✍ Scribed by A.D. Caplin; S.S. Bungre; S.M. Cassidy; J.R. Laverty; Z.X. Shen

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 421 KB
• Volume: 168
• Category: Article
• ISSN: 0378-4371
• DOI: 10.1016/0378-4371(90)90377-5

✦ Synopsis

The current-voltage characteristics of bulk-sintered YBa2Cu30 7 have been studied in detail. The onset of dissipation indicates that an intergranular critical current can be defined. The magnitudes of the resistance of a single grain boundary and of its critical current are estimated. These estimates lead to values of the r.ic(O ) product for the intergranular weak-links that are of the order of 100 IxV, well within the wide range of r,ic(O ) product measured on bi-crystal grain boundaries by Dimos et al., but two to three orders of magnitude less than that expected from "classical" models of superconducting weak-links.