Superconducting thin films of BiSrCaCuO made by sequential electron beam evaporation

Author

Steinbeck, J. ; Anderson, A.C. ; Tsaur, B-Y. ; Strauss, A.J.

Author_Institution

Rome Air Dev. Center, Hanscom AFB, MA, USA

Volume

25

Issue

2

fYear

1989

fDate

3/1/1989 12:00:00 AM

Firstpage

2429

Lastpage

2432

Abstract

Superconducting thin films of Bi₂Sr₂Ca₁Cu₂O_x have been made by sequential electron-beam evaporation of multiple layers of Bi and Cu metals and (Sr,Ca)F₂ on MgO substrates. The films were annealed at high temperature, first in wet O₂ and then in dry O₂, and cooled to room temperature in dry O₂. The resulting films, which are ~1 μm thick, have transition temperatures of ~85 K. X-ray diffraction shows that the films are preferentially oriented with their c-axis perpendicular to the MgO substrate. The best film has a zero-resistance temperature of 90 K and critical-current densities of 8×10⁴ A/cm² at 77 K and 2.5×10⁵ A/cm² at 4.2 K

Keywords

X-ray diffraction examination of materials; annealing; bismuth compounds; calcium compounds; critical current density (superconductivity); electron beam deposition; high-temperature superconductors; strontium compounds; superconducting thin films; superconducting transition temperature; 1 micron; 4.2 K; 77 K; 85 K; 90 K; Bi₂Sr₂Ca₁Cu₂O_x; BiSrCaCuO; MgO; X-ray diffraction; c-axis; critical-current densities; dry O₂; high temperature annealing; high temperature superconductor; preferential orientation; sequential electron beam evaporation; thin films; transition temperatures; wet O₂; zero-resistance temperature; Annealing; Bismuth compounds; Electron beams; Furnaces; Substrates; Superconducting films; Superconducting thin films; Temperature; Water heating; Water resources;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.92797

Filename

92797