Patent ID: 7056866

Claim:
A composition which is superconductive at a temperature of 70°K and higher, comprising: a metal oxide the formula [L l−x M x ] a A b O y wherein; “L” is yttrium, lanthanum, neodymium, samarium, europium, gadolinium, dyprosium, holmium, erbium, thulium, ytterbium, lutetium, or mixtures thereof, “M” is barium, strontium, or mixtures thereof; “A” is copper, “x” is from about 0.65 to 0.80; “a” is 1; “b” is 1; and “y” is a value from about 2 to about 4 that provides the metal oxide with zero electrical resistance at a temperature of 70°K or above.