Patent ID: 6300284
Filing Date: 2001-10-09
Classification: H01L

Abstract:
A copper-based high-temperature superconducting material comprising:a carrier supply layer overdoped with carriers; anda superconducting layer comprised of at least three CuO.sub.2 planes which consist of at least two overdoped outer CuO.sub.2 planes and at least one optimum-doped inner CuO.sub.2 plane and that are selectively doped with said carriers,wherein said superconducting material having a composition formula:Cu.sub.1-x M.sub.x (Ba.sub.1-y Sr.sub.y).sub.2 (Ca.sub.1-z L.sub.z).sub.n-1 Cu.sub.n O.sub.2n+4-win which M is one or more members selected from a group consisting of Tl, Hg, Bi, Pb, In, Ga, Al, B, C, Si, Sn, Ag, Au, S, N, P, Mo, Re, Os, Cr, Ti, V, Fe, lanthanide series elements and alkaline metals;L is one or more members selected from a group consisting of Mg, Y and lanthanide series elements;0.ltoreq.x.ltoreq.0.9;0.ltoreq.y.ltoreq.1;0.ltoreq.z.ltoreq.1;0.ltoreq.w.ltoreq.4; and0.ltoreq.n.ltoreq.16;whereby a high superconducting transition-temperature (Tc) is maintained to be not less than 116 K, critical current density (Jc) is improved to be 5.times.10.sup.6 A/cm.sup.2 (77 K, 0 T), and irreversible field (Hirr) is improved to be not less than 7 T, wherein said superconducting material has a carrier concentration of at least about 0.5/CuO.sub.2.