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Flux Pinning of Bi2Sr2CaCu2O8+γ/Ag Superconductors Utilizing (Sr,Ca)14Cu24O41 Defects and Nanophase Al2O3 and Au Particles



T J. Haugan, Winnie K. Wong-Ng, Lawrence P. Cook, H J. Brown, L Swartzendruber, D T. Shaw


Investigations into flux pinning of Bi2Sr2 CaCu2O8+γ /Ag (Bi-2212/Ag) thick film conductors utilizing micron-sized (Sr,Ca)14Cu24O41 and nanophase Al2O3 and Au particles are described. Addition of defect particles delayed and reduced formation of 2212 c-axis texture, while improving film quality by inhibiting Sr:Ca:Cu:O defect formation. Oxide defects were observed to rapidly coarsen in the melt, simultaneous to beneficial increase of 2212 texture. Nanophase Al2O3 reacted quickly (3 Al2O6, where the Sr:Ca ratio closely matched the Sr:Ca composition of the 2212 matrix. Addition of nanophase Al2O3 improved the Jc(1T) from 20 K to 30 K, e.g. (Jc(30K,1T)/Jc(5K,0T) = 0.07, 0.005 and
Physica C-Superconductivity and Its Applications
No. 1-4


(Sr, Ca)<sub>14</sub>Cu<sub>24</sub>O<sub>41</sub>, (Sr, Ca<sub>3</sub>Al<sub>2</sub>O<sub>6</sub>), Bi<sub>2</sub>Sr<sub>2</sub>CaCu<sub>2</sub>O<sub>8+{gamma</sub>, critical current density, flux pinning, Nanophase Al<sub>2</sub>O<sub>3</sub>, nanophase au


Haugan, T. , Wong-Ng, W. , Cook, L. , Brown, H. , Swartzendruber, L. and Shaw, D. (2000), Flux Pinning of Bi<sub>2</sub>Sr<sub>2</sub>CaCu<sub>2</sub>O<sub>8+&#947;</sub>/Ag Superconductors Utilizing (Sr,Ca)<sub>14</sub>Cu<sub>24</sub>O<sub>41</sub> Defects and Nanophase Al<sub>2</sub>O<sub>3</sub> and Au Particles, Physica C-Superconductivity and Its Applications (Accessed April 20, 2024)
Created June 1, 2000, Updated February 19, 2017