Factors suppressing transport critical current in Ag/Bi2223 tapes

Osamura, K; Nonaka, S; Matsui, M; Oku, T; Ochiai, S; Hampshire, DP

Abstract

The microstructural factors limiting the critical current density J(c) have been investigated for the silver-sheathed Bi2223 tapes prepared by the powder-in-tube technique. In a hierarchy among them, which factor is the most effective in determining J(c) depends on how extensively each of them occurs. The J(c) was found to increase when the volume fraction of 2223 phase increases, suggesting the importance of the connectivity among 2223 grains. The J(c) also increased with decreasing amount of residual carbon. The temperature and magnetic field dependences of J(c) indicated characteristics of Josephson currents through superconducting-normal-superconducting barriers. After a discussion based on the alternative current limiting mechanisms proposed up to now, it is suggested that the homophase grain boundary limits the J(c). (C) 1996 American Institute of Physics.

Citation

Osamura, K., Nonaka, S., Matsui, M., Oku, T., Ochiai, S., & Hampshire, D. (1996). Factors suppressing transport critical current in Ag/Bi2223 tapes. Journal of Applied Physics, 79(10), 7877-7882. https://doi.org/10.1063/1.362398

• Journal Article Type: Article
• Publication Date: 1996-05
• Journal: Journal of Applied Physics
• Print ISSN: 0021-8979
• Electronic ISSN: 1089-7550
• Publisher: American Institute of Physics
• Volume: 79
• Issue: 10
• Pages: 7877-7882
• DOI: https://doi.org/10.1063/1.362398
• Keywords: SILVER-SHEATHED TAPES; GRAIN-BOUNDARIES; MODEL
• Public URL: https://durham-repository.worktribe.com/output/1581064