Studies of the superconducting properties of YBCO/Ag/YBCO proximity junctions using a ceramic composite ring
✍ Scribed by M.A.-K. Mohamed; J. Jung
- Publisher
- Elsevier Science
- Year
- 1991
- Tongue
- English
- Weight
- 202 KB
- Volume
- 185-189
- Category
- Article
- ISSN
- 0921-4534
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✦ Synopsis
We have studied the properties of YBCO/Ag/YBCO proximity interfaces in a YIBa2Cu3OT_8 composite ring close to Tc; the junction critical current as a function of temper'anne (76-85IO and magnetic field (up to 50G). If a SNS junction is a part of a composite superconducting ring, the magnitude and relaxation of a macroscopic persistent current circulating around the ring provides a direct evidence that the junctions are really superconducting. We manufactured a SQUID-like ceramic ring containing two parallel SNS junctions and measured profiles of the trapped magnetic field due to the persistent current generated in the zero-field-cooled ring. The junction critical current was found to be in reasonable agreement with a formula for a SNS junction:
We report on studies of the superconducting properties of YBCO/Ag/YBCO proximity junctions in YIBa2Cu307.a ceramic rings. A ring provides the appropriate geometry to investigate SNS interfaces since the presence of macroscopic persistent current circulating around the ring is a direct evidence that junctions are really superconducting. If a SNS junction is a part of a composite superconducting ring, its superconducting properties, fike junction critical current and coupling energy, can be studied in terms of the magnitude and relaxation of the persistent current. Persistent currents in YiBa2Cu307.8 rings can be examined by measuring the