Influence of hydrogen on the superconducting properties of titanium-niobium alloys and of compounds with A15-structure

Experimental results are presented regarding the effect of hydrogen content on the superconducting properties of Ti-N alloys and A15 intermetallic compounds (including Nb2Ge, Nb3Sn, V3Ga, and V3Si). It is found that hydrogen leads to a decrease in the transition temperature of Ti-Nb alloys; about 1 at% H reduces the critical temperature by 0.1-0.2 K. In A15 intermetallics, the transition temperature and the critical current were also decreased by the presence of hydrogen. It is concluded that Ti-Nb superconducting alloys are less sensitive in terms of their superconducting properties to the presence of hydrogen than are A15 intermetallics.