Superconductive elements and method for producing the same. [Nb--Al; Nb--Ga; Nb--Al--Ge; Nb--Ga--Al]

This patent concerns a superconductive element comprising a substrate, at least one face of which is composed of alumina, and a layer of a superconductive compound of the Nb--Al, Nb--Ga, Nb--Al--Ge or Nb--Ga--Al system formed on the alumina face, which exhibits an excellent critical current density in either a low magnetic field or a high magnetic field and simultaneously has a high critical temperature, and in which peeling or cracking is not caused, and a method for preparing such superconductive element comprising the step of vaccum depositing the above-noted superconductive compound on an alumina surface of a substrate. 17 fig. (Official Gazette)