Abstract
We studied the origin of peak effect in the magnetic field dependence of Jc in NdBa2Cu3O7-δ single crystals. The single crystals were grown by the slow cooling method under various partial O2 pressures(PO2) (0.04∼1%) in Ar atmosphere. We found that the peak effect depends on PO2 and it disappears for the crystals grown under low PO2∼0.04%. This result demonstrates the important role of Nd/Ba substitution for the peak effect because it is known that the Nd/Ba substitution decreases with lowering PO2. We also investigated the role of oxygen vacancies in the peak effect for the crystals with different amount of Nd/Ba substitution. We found that the main cause of peak effect in fully oxygenated crystals is due to local low Tc regions caused by the Nd/Ba substitution rather that those by the oxygen vacancies.
Original language | English |
---|---|
Pages (from-to) | II10.8.1-II10.8.6 |
Journal | Materials Research Society Symposium - Proceedings |
Volume | 659 |
Publication status | Published - 2001 |
Externally published | Yes |
Event | High Temperature Superconductors - Crystal Chemistrym Processing and Properties - Boston, MA, United States Duration: 2000 Nov 27 → 2000 Dec 1 |
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering