Improvement of flux pinning properties in Fe3O4 nanoparticle-doped Bi1.6Pb0.4Sr2Ca2Cu3O10+δ superconductors

• Published in: Materials letters Vol. 298; p. 130015
• Main Authors: Pham, An T., Tran, Dzung T., Pham, Ha H., Nam, Nguyen H., Tai, Luu T., Tran, Duc H.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01-09-2021; Elsevier BV
• Subjects: Ceramics; Critical current density; Flux pinning; Iron oxides; Materials science; Nanoparticles; Superconductors; Nanoparticles; Superconductors; Ceramics
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2021.130015

•Fe3O4 nanoparticles were doped into bulk Bi1.6Pb0.4Sr2Ca2Cu3O10+δ samples.•Collective pinning theory was applied to describe in-field Jc of all samples.•Jc in the Fe3O4 doped samples was enhanced with proper doping contents.•Improved flux pinning properties were proved by Dew-Hughes and Arrhenius models.
The flux pinning properties of polycrystalline (Bi1.6Pb0.4Sr2Ca2Cu3O10+δ)1−x(Fe3O4)x, with x = 0.00, 0.01, 0.02, 0.03, 0.04, and 0.05 superconductors were investigated. The collective pinning theory was successfully used to describe the magnetization critical current density (Jc) of all samples. The value of Jc was enhanced by the proper doping contents of Fe3O4 nanoparticles. Possible origins for these achievements were attributed to the increases in both flux pinning force and activation energy. The appearance of the additional point-like pinning centers was confirmed via Dew–Hughes model fitting analysis.