(Ba, Ca).sub.x (.alpha., Dy).sub.1-x Tl.sub.y Cu.sub.1-Y O.sub.3
(Bi, Pb).sub.2, Sr.sub.2 Ca.sub.2 Cu.sub.3 O.sub.x superconducto
(Hg Cu)Bg.sub.2 Ca.sub.2 Cu.sub.3 Oy oxide superconductor and me
(Hg or Pb)-Pr-Tl-Sr-Cu-O based superconductors
(Hg,Cu)Ba.sub.2 Ca.sub.2 Cu.sub.3 O.sub.y oxide superconductor a
(Hg,Pb)-Ba-Ca-Cu-O superconductor and method of manufacturing th
(Nd, Ba).sub.3 Cu.sub.3 O.sub.7-d superconductor film