High temperature superconducting materials
AssigneeCalifornia Institute of Technology
InventorJamil Tahir-Kheli
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Abstract
A superconducting composition of matter including overlapping first and second regions. The regions comprise unit cells of a solid, the first region comprises an electrical insulator or semiconductor, and the second region comprises a metallic electrical conductor. The second region extends through the solid and a subset of said second region comprise surface metal unit cells that are adjacent to at least one unit cell from the first region. The ratio of the number of said surface metal unit cells to the total number of unit cells in the second region being at least 20 percent.
Claims20
A cuprate, comprising:
- YBaCuO where at least 5% of the Y atoms are replaced by +2 oxidation state atoms, Mg, Ca, Sr, Zn, Cd, Cu, Ni, or Co, at least 5% of the Y atoms are replaced by +4 oxidation state atoms, Ti, Zr, Hf, C, Si, Ge, Sn, or Pb;
- and a total concentration of dopants, comprising the +2 oxidation state atoms and the +4 oxidation state atoms, is greater than 20%.
A method of making a cuprate, comprising:
- synthesizing YBaCuO where at least 5% of the Y atoms are replaced by +2 oxidation state atoms, Mg, Ca, Sr, Zn, Cd, Cu, Ni, or Co, at least 5% of the Y atoms are replaced by +4 oxidation state atoms, Ti, Zr, Hf, C, Si, Ge, Sn, or Pb;
- and a total concentration of dopants, comprising the +2 oxidation state atoms and the +4 oxidation state atoms, is greater than 20%;
- and
- associating a change in gradient in a plot of Tc vs. doping density with an S-wave property of the cuprate.
A method of using a cuprate, comprising:
- obtaining a wire comprising a cuprate comprising YBaCuO where at least 5% of the Y atoms are replaced by +2 oxidation state atoms, Mg, Ca, Sr, Zn, Cd, Cu, Ni, or Co, at least 5% of the Y atoms are replaced by +4 oxidation state atoms, Ti, Zr, Hf, C, Si, Ge, Sn, or Pb;
- and a total concentration of dopants, comprising the +2 oxidation state atoms and the +4 oxidation state atoms, is greater than 20%;
- and
- using the cuprate as an S-wave superconductor.
Dependencies are inferred from the claim text.