Devices and systems based on novel superconducting material

Details Devices and systems based on novel superconducting material Devices and systems based on novel superconducting material

H - Electricity

01

L

356/112, 31/166,

H01L 39/12 (2006.01) C04B 35/45 (2006.01)

Patent

CA 1334620

Novel superconductive oxides are disclosed. The oxides all have layered perovskite-like crystal structure and manifest superconductivity above about 77K. An exemplary material has composition Bi2.2Sr2Ca0.8CU2O8. Inventive materials are described by the nominal formula X2+yM3-yCu2O8?.delta. or by X2+xMn-xCUn-1O2+2n+x/2?.delta., where X typically is Bi, or Bi together with Pb or other appropriate substituent, M is one or more divalent ion or mixture of monovalent and trivalent ion, n is an integer greater than 3, O ? y ? 0.3, x = p/q, where p and q are integers and p<q, and O ? .delta. ? 0.5. Associated with the inventive compounds typically is a superlattice structure, with Tc of the compound typically being correlated with the superlattice spacing. The inventive compounds are typically relatively ductile. In some preferred embodiments X is Bi and Pb, M is Sr and Ca, the Pb/Bi ratio is between 0.2 and 0.5, and the Sr/Ca ratio is between 0.5 and 2.

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