Magnetic Field Dependence of Critical Current and Microstructure in TFA-MOD ${\rm Y}_{1-x}{\rm Sm}_{x}{\rm Ba}_{2}{\rm Cu}_{3}{\rm O}_{y}$ With Nanoparticles for Coated C

Artificial pinning centers (APC) for TFA-MOD Y_1-xSm_xBa₂Cu₃O_y (YSmBCO) coated conductors were introduced to enhance J_c under the magnetic fields and to improve the magnetic field angular dependence of J_c. The coated conductors showed high J_c and isotropic J_c-B-thetas properties with the ratio (J_c,_min/J_c,_max) of 0.91 (77 K, B = 1 T ). From the results of microstructural observation, BaZrO₃ (BZO) nanoparticles were uniformly dispersed in the films by introduction of Zr-salt into YSmBCO solution. The nanoparticles were maintained uniformly not only along the lateral direction but also along the thickness one. It could be considered that the uniform dispersion of BZO nanoparticles in TFA-MOD REBCO coated conductors may act as flux pinning centers to enhance the J_c independent from the angle of the applied magnetic fields.