Structural and Superconducting Property Variations with Nominal Mg Non-Stoichiometry in MgxB2 and Its Enhancement of Upper Critical Field

By applying a combination of characterisation tools, changes in structural and superconducting properties with nominal Mg non‐stoichiometry in MgxB2 are found. The non‐stoichiometry produces enhanced in‐field critical current densities (Jc's) and upper critical field / irreversibility field (Hc...

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Bibliographic Details
Published in:Advanced functional materials 2008-01, Vol.18 (1), p.113-120
Main Authors: Chen, S. K., Serquis, A., Serrano, G., Yates, K. A., Blamire, M. G., Guthrie, D., Cooper, J., Wang, H., Margadonna, S., MacManus-Driscoll, J. L.
Format: Article
Language:English
Subjects:
Critical field
Magnesium
Magnesium boride
Superconductors
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Summary:By applying a combination of characterisation tools, changes in structural and superconducting properties with nominal Mg non‐stoichiometry in MgxB2 are found. The non‐stoichiometry produces enhanced in‐field critical current densities (Jc's) and upper critical field / irreversibility field (Hc2/Hirr(T)) values. Upper critical fields of ∼ 21 T (4.2 K) were obtained in nominal Mg‐deficient samples compared to ∼ 17 T (4.2 K) for near‐stoichiometric samples. By applying a combination of characterisations, conclusive experimental evidence of changes in structural and superconducting properties with nominal Mg non‐stoichiometry in MgxB2 is presented. The non‐stoichiometry produces enhanced in‐field critical current densities and upper critical field/irreversibility field values. Upper critical fields of ∼21 T (4.2 K) were obtained in nominal Mg‐deficient samples compared to ∼17 T (4.2 K) for near‐stoichiometric samples.
ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.200700254