Title :
Magnetic-field angle dependence of the critical current density in high-quality Bi/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub x/ thin films
Author :
Yamasaki, H. ; Endo, K. ; Kosaka, S. ; Umeda, M. ; Misawa, S. ; Yoshida, S. ; Kajimura, K.
Author_Institution :
Electrotech. Lab., MITI, Ibaraki, Japan
fDate :
3/1/1993 12:00:00 AM
Abstract :
Critical current densities, J/sub c/, have been investigated in as-deposited Bi/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub x/ thin films with c-axis orientation, which were prepared by metalorganic chemical vapor deposition (MOCVD). One of these films showed record high J/sub c/ values for Bi-oxide thin films: 1.3*10/sup 10/ A/m/sup 2/ at 70 K; 10/sup 11/ A/m/sup 2/ at 30 K. Almost-field-independent J/sub c/ was observed in the magnetic fields applied parallel to the film surface (a-b plane) in a wide temperature range (>
Keywords :
bismuth compounds; calcium compounds; critical current density (superconductivity); flux pinning; high-temperature superconductors; strontium compounds; superconducting thin films; 30 K; Bi/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub x/; HTSC; MOCVD; c-axis orientation; critical current density; high-quality Bi/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub x/ thin films; intrinsic pinning theory; magnetic field angle dependence; metalorganic chemical vapor deposition; stepwise flux inclusion; wide temperature range; Bismuth; Chemical vapor deposition; Critical current density; MOCVD; Magnetic field measurement; Magnetic fields; Magnetic films; Sputtering; Strontium; Temperature distribution;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
