Nb.sub.3 Ge superconductive films grown with air
AssigneeGeneral Electric Company
InventorRaymond A. Sigsbee
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Abstract
A superconductive film of Nb.sub.3 Ge is produced by providing within a vacuum chamber a heated substrate and sources of niobium and germanium, reducing the pressure within the chamber to a residual pressure no greater than about 10.sup.-5 mm Hg, introducing air into the resulting evacuated chamber in controlled amounts and vaporizing the niobium and germanium to deposit a film of Nb.sub.3 Ge on the heated substrate.
Claims6
A superconductive continuous film of Nb.sub.3 Ge having a surface area of at least one square centimeter ranging in composition up to about 2 atomic % from stoichiometric composition having a critical temperature T.sub.c of at least about 19 degrees Kelvin, said critical temperature T.sub.c being the temperature at which said film becomes 50% superconducting in that it has one half of its normal conductor resistance existing at three degrees Kelvin above T.sub.c, said film having a transition width of less than one degree Kelvin extending from the temperature in degrees Kelvin at which said film becomes 10% superconducting in that it has 90% of its normal resistance existing at three degrees Kelvin above T.sub.c to the temperature in degrees Kelvin at which said film becomes 90% superconducting in that it has 10% of its normal conductor resistance existing at three degrees Kelvin above T.sub.c.
Dependencies are inferred from the claim text.