Title :
Weak link property in superconducting Y-Ba-Cu-O prepared by QMG process
Author :
Matsushita, T. ; Otabe, E.S. ; Fukunaga, T. ; Kuga, K. ; Yamafuji, K. ; Kimura, K. ; Hashimoto, M.
Author_Institution :
Dept. of Comput. Sci. & Electron., Kyushu Inst. of Technol., Iizuka, Japan
fDate :
3/1/1993 12:00:00 AM
Abstract :
The weak link property in a QMG (quench and melt growth)-processed single-grain Y-Ba-Cu-O specimen was investigated by measuring the dependence of the critical current density on temperature, history of magnetic field application, and its enhancement under a longitudinal field geometry. The results show that weak-link regions still remain in the specimen. It is speculated that these link regions, which can transport superconducting currents at low temperatures, are degraded with increasing temperature and lose superconductivity around 20 K.<>
Keywords :
barium compounds; critical current density (superconductivity); high-temperature superconductors; superconducting junction devices; yttrium compounds; 20 K; QMG process; YBa/sub 2/Cu/sub 3/O/sub 7- delta /; critical current density; high temperature superconductors; longitudinal field geometry; magnetic field history; quench and melt growth; single-grain; superconducting currents; temperature dependence; weak link property; Critical current density; Current measurement; Degradation; Density measurement; Geometry; History; Magnetic field measurement; Magnetic properties; Temperature dependence; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
