Improvement of the Superconducting Properties of GdBa2Cu3O7-δ with Nano-Sized Ferrite Addition
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We have been investigating the effect of (CoFe2O4)x and (ZnFe2O4)x (x is the wt%) nano-sized ferrites on the superconducting (SC) properties of the high-Tc SC compound GdBa2Cu3O7-δ (Gd123) prepared by the conventional solid-state reaction technique. In this work, the magnetic hysteresis for pure Gd123 samples and samples added with nano-sized ferrites was measured using a superconducting quantum interference device (SQUID) magnetometer using a dc field up to 30,000 Oe. The magnetic Jc was estimated using the extended Bean model. While a clear increase in Jc values with the addition of (CoFe2O4)x nano-sized ferrites is observed, a less clear positive effect on the Jc values is observed with the addition of (ZnFe2O4)x nano-sized ferrites. These results indicate an improvement of grain connectivity, decrease of voids between the grains, and decrease of porosity in Gd123 compound resulting from CoFe2O4 addition consistent with the mechanical properties measured before. (CoFe2O4)x nano-sized ferrite addition has thus resulted in an improvement in the SC properties of Gd123 high-Tc SC compound making it more convenient for applications.
KeywordsGd123 CoFe2O4 ZnFe2O4 Nanoferrite Magnetic hysteresis Magnetic Jc Extended Bean model
This work was performed in the Materials Science Lab, Faculty of Science, Beirut Arab University and in the Department of Applied Physics, Faculty of Science and Technology, Keio University, Kanagawa, Japan. We acknowledge Dr. D. El-Said Bakeer for contribution in sample preparation.
Yoichi Kamihara was supported by the Japan Society for the Promotion of Science (JSPS) through a Grant-in-Aid for scientific Research (B) (grant no. 17H03239).
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