Patent ID: 7807608

Claim:
A coated conductor comprising: a substrate, a high temperature superconductor layer and at least one or more buffer layers, wherein at least one of the buffer layers is a template for biaxially orienting the high temperature superconductor layer wherein the template is composed of a polycrystalline film made from a non-stoichiometric material having the nominal chemical formula A 2−x B 2+x O 7 with B being at least one selected from Zr, Hf, Sn, Pb and Ti; A being at least one selected from La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Y, Tm, Yb and Lu; and x ≠0; wherein the substrate is textured and wherein the lattice parameters of the non-stoichiometric material of the polycrystalline film are adjusted to the lattice parameters of the superconductor layer to be grown by variation of x wherein x has a value of 0.05 <x<0.3 and −0.3 <x<-0.05, respectively.