Title :
Fabrication of Bi2Sr2CaCu2O8+δ films and intrinsic Josephson junctions
Author :
Sudershan, Y.S. ; Yurgens, August ; Winkler, Dag
Author_Institution :
Dept. of Eng. Phys., Chalmers Univ. of Technol., Goteborg, Sweden
fDate :
3/1/2001 12:00:00 AM
Abstract :
We have investigated Bi2Sr2Ca1Cu 2O8+δ (Bi2212) films made by pulsed laser ablation technique with various compositions of the target material like Bi2Sr2Ca1Cu2O8, Bi4Sr2Ca1Cu2O8 (Bi4212), Bi2Sr2Ca1Cu4O8 (Bi2214) and Bi4Sr3Ca3Cu4O 8 (Bi4334). Films from Bi2212 and Bi4334 targets show onset at Tc~91 K and zero resistance at ~84 K and 71 K respectively. The Bi2214 films show an onset at ~91 K and zero resistance at ~60 K. Unlike these, Bi4212 films do not exhibit any superconducting transition. We also report a comparison of the microstructure, connectivity and crystallinity of these films determined by AFM and XRD. In addition, the fabrication of intrinsic junctions in films deposited on high angle step edges on SrTiO3 is reported
Keywords :
Josephson effect; bismuth compounds; calcium compounds; high-temperature superconductors; pulsed laser deposition; strontium compounds; superconducting thin films; superconducting transition temperature; 71 K; 84 K; 91 K; Bi2Sr2Ca1Cu4O8 ; Bi2Sr2CaCu2O8+δ films; Bi2Sr2CaCu2O8; Bi4Sr2Ca1Cu2O8 ; Bi4Sr3Ca3Cu4O8 ; connectivity; crystallinity; high angle step edges; intrinsic Josephson junctions; microstructure; pulsed laser ablation technique; superconducting transition; Bismuth; Composite materials; Josephson junctions; Laser ablation; Microstructure; Optical device fabrication; Optical materials; Optical pulses; Strontium; Superconducting films;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
