Enhancing Superconducting Properties of MgB2 by Addition of Magnetic Particles

Main results of ongoing comprehensive study of the influence of magnetic nanoparticles (MNP) on superconducting properties (transition temperature T c , critical fields and critical current density, J c , etc.) of high-quality Fe-sheathed MgB 2 wires are briefly reviewed. We prepared over 60 Fe-shea...

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Bibliographic Details
Published in:Journal of superconductivity and novel magnetism 2015-02, Vol.28 (2), p.425-430
Main Authors: Novosel, N., Galić, S., Pajić, D., Zadro, K., Babić, E.
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Condensed Matter Physics
Magnetic Materials
Magnetism
Original Paper
Physics
Physics and Astronomy
Strongly Correlated Systems
Superconductivity
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Summary:Main results of ongoing comprehensive study of the influence of magnetic nanoparticles (MNP) on superconducting properties (transition temperature T c , critical fields and critical current density, J c , etc.) of high-quality Fe-sheathed MgB 2 wires are briefly reviewed. We prepared over 60 Fe-sheathed MgB 2 wires doped with 12 different types and quantities of MNPs, such as elemental magnets, magnetic borides, ferrites, and rare earth borides. Generally, doping with MNPs suppresses T c and higher MNP contents cause deterioration of superconducting properties of wires. However, light doping (≤ 2.5 wt%) with some types of MNPs (e.g., Ni) improved flux pinning and in-field J c of wires. Particularly promising seems co-doping with core-shell MNPs, where both critical fields and J c were simultaneously enhanced. Possible origins of these improvements (such as magnetic flux pinning) are briefly discussed.
ISSN:1557-1939
1557-1947
DOI:10.1007/s10948-014-2807-6