High critical current density thick MOD-derived YBCO films

Author

Smith, J.A. ; Cima, M.J. ; Sonnenberg, N.

Author_Institution

Ceramics Process. Res. Lab., MIT, Cambridge, MA, USA

Volume

9

Issue

2

fYear

1999

fDate

6/1/1999 12:00:00 AM

Firstpage

1531

Lastpage

1534

Abstract

High critical current density thick MOD (metal-organic-deposition)-derived Ba/sub 2/YCu/sub 3/O/sub 7-x/ (BYC) films have been prepared on latticed matched single crystal lanthanum aluminate substrates. Critical current densities of approximately one million amps per square centimeter (at 77 K) have been obtained from one micron thick BYC films. These superconducting films were prepared from a single MOD coating. Substrate coatings of a mixed metal trifluoroacetate precursor were first converted into high quality mixed metal oxyfluoride films by heat treating under controlled conditions. These films were then patterned and subsequently converted into epitaxial BYC by exposure to water vapor at higher temperatures, High critical current density films were obtained by controlling the conversion kinetics of the mixed metal oxyfluoride films into BYC.

Keywords

MOCVD coatings; barium compounds; critical current density (superconductivity); high-temperature superconductors; superconducting thin films; yttrium compounds; 77 K; YBCO films; YBa/sub 2/Cu/sub 3/O/sub 7/; conversion kinetics; critical current densities; high critical current density; high quality mixed metal oxyfluoride films; high temperature superconductor; latticed matched; mixed metal trifluoroacetate precursor; superconducting films; Ceramics; Coatings; Conductive films; Critical current density; Furnaces; Methanol; Substrates; Superconducting films; Temperature; Yttrium barium copper oxide;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.784685

Filename

784685