Flux Pinning Enhancements of YBa2Cu3O7-x with Nanosize Magnetic Additions

Different methods of flux pinning are being tested world-wide to enhance critical currents (Ics) of high temperature superconductor YBa2Cu3O7-x (YBCO) coated conductors exposed to high magnetic fields. Magnetic materials are interesting to consider as flux pinning additions because of their potentia...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2020-03, Vol.756 (1)
Main Authors: Sebastian, M A, Pierce, N A, Maartense, I, Kozlowski, G., Haugan, T J
Format: Article
Language:English
Subjects:
Barium hexaferrite
Conductors
Critical current density
Flux pinning
High temperature superconductors
Magnetic fields
Magnetic materials
Multilayers
Optimization
YBCO superconductors
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Summary:Different methods of flux pinning are being tested world-wide to enhance critical currents (Ics) of high temperature superconductor YBa2Cu3O7-x (YBCO) coated conductors exposed to high magnetic fields. Magnetic materials are interesting to consider as flux pinning additions because of their potential for very strong pinning strength. To our knowledge, there have been limited demonstrations of magnetic pinning additions to YBCO conductors. This paper describes the study of different M magnetic phase additions to YBCO including M = BaFe12O19, La0.67Ca0.33MnO3, and other oxide phases. Nanosize additions were incorporated by depositing multilayer (M/YBCO)N films to minimize degradation of Tc, and testing volume % additions of M phase from 0.5 % to 5%. Results indicate that Tc onsets are depressed with magnetic additions, however in some cases interestingly without degrading the transition width. With optimization of magnetic additions a 50% increase of critical current density has been obtained, for low magnetic fields of < 10,000 Oe at 65K to 77K. Microstructural and superconducting properties are summarized, including SEM analysis.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/756/1/012026