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

研究成果: Conference article査読


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.

ジャーナルMaterials Research Society Symposium - Proceedings
出版ステータスPublished - 2001
イベントHigh Temperature Superconductors - Crystal Chemistrym Processing and Properties - Boston, MA, United States
継続期間: 2000 11 272000 12 1

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学


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