Superconducting materials including La-Sr-Nb-O, Y-Ba-Nb-O, La-Sr- Nb-Cu-O, and Y-Ba-Nb-Cu-O

摘要

Oxide materials of (L.sub.x A.sub.1-x).sub.i MO.sub.y, (L.sub. x A.sub. 1-x).sub.i M.sub.1-z Cu.sub.z O.sub.y and (L.sub.x A.sub.1-x). sub.i MO. sub.j-&dgr; G.sub.k, wherein L is Sc, Y, lanthanides, etc.; A is Ba, Sr. Ca, etc.; M is V, Nb, Ta, T, Zr or Hf; 0 x 1; 0 z 1; i=1, 3/2 or 2; 0 y≦4; Gis F, Cl or N; &dgr; is oxygen defect, and having a perovskite-like crystal structure, show superconductivity at a temperature higher than the liquid nitrogen temperature.