Nd/Ba substitution and oxygen deficiency effects on the pinning properties of NdBa2Cu3O7-δ single crystals

S. Shibata, K. Nakao, A. Yamamoto, Y. Feng, A. K. Pradhan, T. Machi, N. Koshizuka

Research output: Contribution to journalConference article

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 languageEnglish
Pages (from-to)II10.8.1-II10.8.6
JournalMaterials Research Society Symposium - Proceedings
Volume659
Publication statusPublished - 2001 Dec 1
EventHigh Temperature Superconductors - Crystal Chemistrym Processing and Properties - Boston, MA, United States
Duration: 2000 Nov 272000 Dec 1

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ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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