Title :
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
fDate :
3/1/1989 12:00:00 AM
Abstract :
Superconducting thin films of Bi2Sr2Ca1 Cu2Ox 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; Bi2Sr2Ca1Cu2Ox ; 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;
Journal_Title :
Magnetics, IEEE Transactions on
