Flux Pinning and Intergranular Critical Current Density Study in SmBa2Cu3-xFexO7 Superconductor

Abstract:

Low field ac magnetic susceptibility study for SmBa2Cu3-xFexO7 superconductors with various x values(0.00 ≤ x ≤ 0.06) is reported. The results of ac susceptibility are used to determine the pinning force density andintergranular critical current density. However, two different values of q factor obeying the law

q

L m

c

m a H

T

(1 T ) ( )

are extracted from the slope of each plot. The first corresponds to smaller field (0.00 ≤

Hm≤ 300 A/m), and its values are between 0.19 and 0.66. While, the second corresponds to higher field (300 A/m ≤Hm≤ 600 A/m) and its values are between 0.30 and 0.91. Compared to pure sample, the pinning force density isdecreased by 0.01 of Fe addition, followed by an increase with further increase of Fe up to 0.06. Similar behavior is

obtained for intergranular critical current density. These results are discussed in terms of induced weak link which isproduced by Fe doping in Sm: 123 superconductors.