Patent ID: 7985713

Claim:
A method for manufacturing a superconducting magnesium boride thin film, comprising the steps of: forming on a substrate as the surface modification layer at least one of vapor deposition films containing one or more selected from a 3d metal element selected from Ti, Zn, Cu, Cr, Zr, and Co, compounds of the metals; an oxide selected from MgO, ZnO, and Al 2 O 3 ; a Group VB element selected from As, Bi, and Sb, Mg, and B; maintaining the substrate at a temperature of 200° C. or less in a molecular beam epitaxy apparatus of an ultra high vacuum atmosphere of 4×10 −5 Pa or less; simultaneously depositing Mg and B supplying an Mg vapor and a B vapor to the substrate under conditions in which the flow rate of the B vapor is set to 0.05 nm/sec or less in terms of a vapor deposition rate; and an Mg/B molar ratio is selected in a range of 1/1 to 12/1, wherein an MgB x vapor deposition film having a super conducting transition MgB x , wherein x is determined by Mg/B molar ratio in the range of 1 to 10 or less on the surface modification layer provided therebetween.