Microstructure dependence of the c-axis critical current density in second-generation YBCO tapes.
- Materials Science Division
C-axis current flow in high temperature superconductor (HTS) tape-shaped wires arises in configurations where the local wire axis is not perpendicular to the local magnetic field, such as in power cables with helically wound HTS tapes. The c-axis critical current density J{sub c}{sup c} has been recently found to be orders of magnitude lower than the ab-plane critical current density J{sub c}{sup ab}. Here we report on J{sub c}{sup c} (77 K, sf) values of various YBa{sub 2}Cu{sub 3}O{sub 7}-based (YBCO) tapes with different microstructures. Our results show that the value of J{sub c}{sup c} (77 K, sf) decreases significantly with increasing concentration of ab-plane stacking faults in YBCO thin films and that the critical current anisotropy {gamma} = J{sub c}{sup ab}/J{sub c}{sup c} can reach values as high as 2070, implying that in the highest-anisotropy tape, {approx}20% of the tape width carries c-axis current in a helically wound power cable.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); ENERGY FRONTIER RESEARCH CENTER - CENTER FOR EMERG
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 1033871
- Report Number(s):
- ANL/MSD/JA-71891; JAPIAU; TRN: US201203%%149
- Journal Information:
- Journal of Applied Physics, Vol. 110, Issue 8; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- ENGLISH
Similar Records
C-axis critical current density of second-generation YBCO tapes.
Second Generation Superconducting Cable with Exfoliated YBCO Filaments