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Structural and Superconducting Property Variations with Nominal Mg Non‐Stoichiometry in MgxB2 and Its Enhancement of Upper Critical Field |
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| Authors: | S?K Chen A Serquis G Serrano K?A Yates M?G Blamire D Guthrie J Cooper H Wang S Margadonna J?L MacManus‐Driscoll |
| Affiliation: | 1. Department of Materials Science and Metallurgy, University of Cambridge, Pembroke Street, Cambridge CB2 3QZ (UK);2. Centro Atomico Bariloche – Instituto Balseiro, Av. Bustillo 9500, S.?C. de Bariloche, (8400) Rio Negro (Argentina);3. Physics Department, The Blackett Laboratory, Imperial College, Prince Consort Road, London, SW7 2BZ (UK);4. Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 0HE (UK);5. Electrical and Computer Engineering Department, Texas A&M University, College Station, Texas 77843‐3128 (USA);6. School of Chemistry, University of Edinburgh, West Mains Road, Edinburgh EH9 3JJ (UK) |
| Abstract: | 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. |
| Keywords: | Critical field Magnesium Magnesium boride Superconductors |