Enhanced Critical Current Density of FeF2 Added YBa2Cu3O7−δ

Autor: Ing Kong, N. A. Mizan, Mohammad Hafizuddin Hj Jumali, E. L. Lim, W. Kong, Roslan Abd-Shukor, H. A. Alwi
Rok vydání: 2012
Předmět:
Zdroj: Journal of Superconductivity and Novel Magnetism. 25:957-960
ISSN: 1557-1947
1557-1939
DOI: 10.1007/s10948-011-1402-3
Popis: The effect of nanosized FeF2 (∼120 nm) addition on the critical current density, J c, of YBa2Cu3O7−δ was studied. YBa2Cu3O7−δ 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 µV/cm criterion. The onset transition temperature, $T_{\mathrm{c}\mbox{-}\mathrm{onset}}$ 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 $T_{\mathrm{c}\mbox{-}\mathrm{onset}}$ 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.
Databáze: OpenAIRE
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