Superconducting properties of MgB2 films electroplated to stainless steel substrates

Abe, Hideki; Nishida, Kenji; Imai, Motoharu; Kitazawa, Hideaki; Kenji Yoshii
December 2004
Applied Physics Letters;12/20/2004, Vol. 85 Issue 25, p6197
Academic Journal
Superconducting MgB2 films have been fabricated on stainless steel substrates by means of electroplating in a molten electrolyte composed of MgCl2, MgB2O4, NaCl, and KCl containing a fractional amount of CuCl2. Microscopic observation has revealed that the electroplated films and substrates are combined with each other through Cu-rich layers at the interfaces. Transport measurements have shown that the electroplated MgB2 films possess an upper critical field, Hc2(0), of 28 T, an irreversibility field, Hirr(0), of 13 T, and a critical current density, Jc(5 K,0 T), of 25 000 A/cm2, which suggests that the electroplating in molten salts is a promising alternative to the powder-in-tube method for the fabrication of MgB2 tapes.


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