Epitaxy of HgBa{sub 2}CaCu{sub 2}O{sub 6} superconducting films on biaxially textured Ni substrates
Superconducting HgBa{sub 2}CaCu{sub 2}O{sub 6} (Hg-1212) films have been coated on biaxially textured Ni substrates buffered with CeO{sub 2}/YSZ/CeO{sub 2} trilayers. A two-step cation-exchange process was employed for Hg-1212 coatings, whereby epitaxial Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub 8} precursor films grown in a fast temperature ramping annealing process were converted to Hg-1212 via diffusive Hg--Tl cation exchange. This minimizes chemical diffusion/reaction of Hg with the substrates and allows Hg-1212 films to inherit the epitaxy and smooth surface morphology of the Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub 8} precursor films. The superconducting transition temperature (T{sub c}) of these Hg-1212 coated conductors is up to 124 K. Self-field critical current densities (J{sub c}) of 2.2x10{sup 6}A/cm{sup 2} at 77 K have been obtained, with J{sub c} values of 0.7x10{sup 6}A/cm{sup 2} achieved at 100 K. These results show Hg-1212 coated conductors may hold promise for electrical power applications above 77 K.
- Sponsoring Organization:
- (US)
- OSTI ID:
- 40205335
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 25 Vol. 77; ISSN 0003-6951
- Publisher:
- The American Physical Society
- Country of Publication:
- United States
- Language:
- English
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