Title :
Pinning enhancement and critical current densities in (Sm0.5 Y0.5)Ba2Cu3O7-δ superconductor
Author :
Lee, Kyu-Won ; Kim, Jin-Tae ; Ha, Dong-Han ; Park, Yong-Ki ; Park, Jong-Chul ; Kim, So-Jung ; Kim, Ha-Gi
Author_Institution :
Supercond. Group, Korea Res. Inst. of Stand. & Sci., Taejon, South Korea
fDate :
9/1/1999 12:00:00 AM
Abstract :
A fabrication method of homogeneous (Sm0.5Y0.5 )Ba2Cu3O7-δ superconductor substituting Y with Sm has been developed using a zone melting process. A sample prepared by this method showed well textured microstructure and (Sm0.5Y0.5)2BaCuO5 particles were uniformly dispersed in large (Sm0.5Y0.5)Ba 2Cu3O7-δ grain. The sample showed a sharp superconducting transition at 90.3 K. The magnetization measurements of the (Sm0.5Y0.5)Ba2Cu 3O7-δ sample exhibited enhanced flux pinning compared with YBa2Cu3O7-δ samples without Sm. Critical current densities of (Sm0.5Y0.5 )Ba2Cu3O7-δ were 1.8×104 A/cm2 at 10 kOe and 77 K
Keywords :
barium compounds; critical current density (superconductivity); crystal microstructure; flux pinning; high-temperature superconductors; magnetisation; samarium compounds; superconducting transitions; yttrium compounds; zone melting; (Sm0.5Y0.5)2BaCuO5 particles; (Sm0.5Y0.5)Ba2Cu3O 7-δ superconductor; (Sm0.5Y0.5)Ba2Cu3O 7; 77 K; 90.3 K; HTSC; critical current densities; enhanced flux pinning; fabrication method; magnetization measurements; pinning enhancement; superconducting transition; well textured microstructure; zone melting process; Critical current density; Crystallization; Grain boundaries; Impurities; Magnetic field measurement; Magnetic fields; Magnetic hysteresis; Magnetization; Samarium; Shape;
Journal_Title :
Magnetics, IEEE Transactions on
