Enhanced Critical Current Density of FeF2 Added YBa2Cu3O7- Delta d

• Published in: Journal of superconductivity and novel magnetism Vol. 25; no. 4; pp. 957 - 960
• Main Authors: Abd-Shukor, R, Kong, I, Lim, E L, Mizan, N A, Alwi, H A, Jumali, M H, Kong, W
• Format: Journal Article
• Language: English
• Published: 01.05.2012
• Subjects: COMPOSITES; COPPER OXIDE; Critical current density; CURRENT DENSITY; DENSITY; FLUID FLOW; Magnetization; MICROSTRUCTURES; Nanocomposites; Nanomaterials; Nanostructure; SUPERCONDUCTIVITY; SUPERCONDUCTORS; TRANSITION TEMPERATURE; YTTRIUM OXIDE
• ISSN: 1557-1939
• DOI: 10.1007/s10948-011-1402-3

The effect of nanosized FeF2 (~120 nm) addition on the critical current density, J c, of YBa2Cu3O7- Delta *d was studied. YBa2Cu3O7- Delta *d superconductor was prepared by the solid-state reaction method with addition of 0 to 0.10 wt% FeF2 additions. The magnetization critical current density, J cm (at 77 K), was estimated from the extended Bean model by using vibrating sample magnetometer (VSM) measurements. The transport critical current density, J ct, was measured using the four-point probe method with the 1 ?V/cm criterion. The onset transition temperature, Tc-onsetTc-onset showed a maximal value at 92 K for 0 to 0.03 wt% additions. J c increased with FeF2 addition up to 0.03 wt%. Addition of FeF2 of more than 0.03 wt% suppressed Tc-onsetTc-onset and J c. The inter-grain current density was enhanced by two orders of magnitude on 0.03 wt% FeF2 addition. In addition to the condensation energy associated with their core, the full vortex magnetic energy by addition of nanosized FeF2 enhanced J c in the system.