AC losses in Sn-doped Bi1.6Pb0.4Sr2(Ca1-xSnx)2Cu3Oδ superconductors

• Main Authors: Azhan, H. (Author), Azman, K. (Author), Halim, S.A (Author), Nazree, A. (Author), Syamsyir, S.A (Author)
• Format: Article
• Language: English
• Subjects: AC loss; AC losses; BSCCO; Calcium; Complex ac susceptibility; Diamagnetism; Lead; Lower temperatures; Magnetic susceptibility; Measurements of; Sn-doped; Solid state reaction method; Solid state reactions; Superconducting grains; Superconducting materials; Superconductivity; Superconductor; Tin
• Online Access: View Fulltext in Publisher; View in Scopus

 Measurements of complex AC susceptibility χ = χ′ + χ″ as a function of temperature have been carried out on Sn-doped Bi1.6Pb0.4Sr2(Ca1-xSnx)2Cu3Oδ superconductor samples prepared via the conventional solid state reaction method. All the samples exhibit perfect diamagnetism below 109 K. The χ′(T) curves display two-step features, indicating the presence of mixed phases and therefore weakening of the grains' coupling. The amount of shielded volume in Sn-free samples is greater than that in Sn-doped samples. The intrinsic peak due to the small AC losses within the grain was not observed in the χ″(T) curves for all samples. However, the coupling peak, TP, for Snfree samples at an applied field of 1.0 Oe was observed at 89 K and shifted to a lower temperature ranging from 59 K to 64.2 K in Sn-doped samples. The amounts of hysteresis losses above the TP in all doped samples were smaller than that of the Sn-free sample. Therefore, the effect of Sn doping suppressed the inter-granular critical current, Jcm, and the presence of weak links that coupled the superconducting grains. © (2014) Trans Tech Publications, Switzerland.