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

  • S. Shibata (a1), K. Nakao (a2), A. Yamamoto (a2), Y. Feng (a2), A.K. Pradhan (a2), T. Machi (a2) and N. Koshizuka (a2)...

Abstract

We studied the origin of peak effect in the magnetic field dependence of Jc in NdBa2Cu3O7- σ 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 than those by the oxygen vacancies.

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

  • S. Shibata (a1), K. Nakao (a2), A. Yamamoto (a2), Y. Feng (a2), A.K. Pradhan (a2), T. Machi (a2) and N. Koshizuka (a2)...

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