Epitaxy of HgBa2CaCu2O6 superconducting films on biaxially textured Ni substrates

Y. Y. Xie, T. Aylug, J. Z. Wu, D. T. Verebelyi, M. Paranthaman, A. Goyal, D. K. Christen

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Superconducting HgBa2CaCu2O6, (Hg-1212) films have been coated on biaxially textured Ni substrates buffered with CeO2/YSZ/CeO2 trilayers. A two-step cation-exchange process was employed for Hg-1212 coatings, whereby epitaxial Tl2Ba2CaCu2O8 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 Tl2Ba2CaCu2O8 precursor films. The superconducting transition temperature (Tc) of these Hg-1212 coated conductors is up to 124 K. Self-field critical current densities (Jc) of 2.2 × 106 A/cm2 at 77 K have been obtained, with Jc values of 0.7 × 106 A/cm2 achieved at 100 K. These results show Hg-1212 coated conductors may hold promise for electrical power applications above 77 K.

Original languageEnglish
Pages (from-to)4193-4195
Number of pages3
JournalApplied Physics Letters
Volume77
Issue number25
DOIs
StatePublished - Dec 18 2000

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