High-current Y-Ba-Cu-O conductor by metal organic chemical vapor deposition on metal substrates.
A metal organic chemical vapor deposition (MOCVD) method has been developed to achieve high currents in Y-Ba-Cu-O (YBCO) superconducting films deposited on biaxially textured buffer layers on polycrystalline (untextured) flexible metal substrates. Optimization of the MOCVD process parameters has yielded critical currents (I{sub c}) greater than 50 A and critical current densities (J{sub c}) higher than 1 MA/cm{sup 2} at 77 K in self-field conditions. High values of critical currents were found to be maintained also in the presence of a magnetic field. At 75 K, with the magnetic field perpendicular to the c-axis (B{perpendicular}c), J{sub c} values of 570,000 A/cm{sup 2} (I{sub c}=20 A) and 240,000 A/cm{sup 2} (I{sub c}=8.5 A) were achieved in fields of 1 and 5 T respectively. With the magnetic field parallel to the c-axis (B{parallel}c), J{sub c} values of 215,000 A/cm{sup 2} (I{sub c}=7.6 A) and 100,000 A/cm{sup 2} (I{sub c}=3.6 A) were achieved in fields of 1 and 2.5 T respectively. At 64 K, the J{sub c} values were 1.2 MA/cm{sup 2} (I{sub c}=43 A) and 770,000 A/cm{sup 2} (I{sub c}=27 A) at 2 and 5 T respectively in the B{perpendicular}c orientation. In the B{parallel}c orientation, the J{sub c} values were 680,000 A/cm{sup 2} (I{sub c}=23.7 A), 520,000 A/cm{sup 2} (I{sub c}=18.2 A) and 300,000 A/cm{sup 2} (I{sub c}=10.6 A) at 1, 2, and 5 T respectively.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- EE; DOD
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 943076
- Report Number(s):
- ANL/ET/JA-37304
- Journal Information:
- Physica C, Journal Name: Physica C Journal Issue: 2000 Vol. 333; ISSN 0921-4534; ISSN PHYCE6
- Country of Publication:
- United States
- Language:
- ENGLISH
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