Alkaline-doped mercury cuprate superconductors

University of Kansas
posted on 08/15/2006

Alkaline-doped superconductors of the formula X M.sub.2 Ca.sub.2 Cu.sub.3 O.sub.8+.alpha. are provided where X is selected from the group consisting of TI, Pb, Mo,Hg and mixtures thereof, M is selected from the group consisting of Ba, Sr and mixtures thereof, and a ranges from zero to about 0.2, and being doped with a dopant selected from the group consisting of Na and Li up to a level of up to about 12% molar ratio, based upon the amount of the element X taken as 100%. The superconductors of the invention exhibit extremely high T.sub.cO values and have high J.sub.c properties as well. The superconductors can be fabricated at relatively low annealing temperatures (750.degree.-820.degree.C.) making them suitable for use as thin films with a variety of conventional substrates.

Detailed Description

Alkaline-doped superconductors of the formula X M.sub.2 Ca.sub.2 Cu.sub.3 O.sub.8+.alpha. are provided where X is selected from the group consisting of TI, Pb, Mo,Hg and mixtures thereof, M is selected from the group consisting of Ba, Sr and mixtures thereof, and a ranges from zero to about 0.2, and being doped with a dopant selected from the group consisting of Na and Li up to a level of up to about 12% molar ratio, based upon the amount of the element X taken as 100%. The superconductors of the invention exhibit extremely high T.sub.cO values and have high J.sub.c properties as well. The superconductors can be fabricated at relatively low annealing temperatures (750.degree.-820.degree.C.) making them suitable for use as thin films with a variety of conventional substrates.

File Number: NCL-0106