MgB2 thick film grown on Stainless steel substrate with ductility

TL;DR

This paper reports the synthesis of a dense MgB2 superconducting thick film on stainless steel using HPCVD, demonstrating high ductility and superconducting transition at 38 K.

Contribution

It introduces a novel method for growing MgB2 thick films on stainless steel with high ductility and good superconducting properties.

Findings

Superconducting transition at 38 K

High ductility with bending to 200 microns

Dense MgB2 crystal structure observed

Abstract

MgB2 thick film was synthesized on the stainless steel substrate by the technique of hybrid physical-chemical vapor deposition (HPCVD), using Mg ingot and B2H6 as the raw materials. The film thickness is about 10 microns. The scanning electron microscope (SEM) images reveal that it is consisting of highly dense MgB2 crystals with the size ranging from 0.2 to 3 microns. The superconducting transition occurs at 38 K (Tc, onset) and ends at 27 K (Tc, zero), giving the transition width of 11 K. The fabricated film exhibits high ductility and remains attached to the substrate after it was bent to a curvature of about 200 microns.