Abstract
High-performance Fe-sheathed MgB2 monocore wires have been fabricated by an in situ method using cheap oleic acid additions as a reliable C source for B lattice substitution. We have analysed the cases of soaking B or Mg + B powders in oleic acid and the influence of the heat treatments used at different steps of wire manufacturing on their superconducting properties. X-ray diffraction, electronic microscopy, and thermogravimetric analysis, together with magnetic and electric transport measurements, have been used to characterize the wires. Doping with oleic acid considerably improves the critical current density, Jc, at medium and high magnetic fields at 5 and 20 K, without deterioration of Jc at low magnetic fields.
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