Patent ID: 8664163

Claim:
An article comprising: an r-cut sapphire substrate carrying a structure comprising: a YSZ layer on the substrate; a first, template, layer of a compound of the formula YBa 2 Cu 3 O 7-x (YBCO), on the YSZ layer; and a second superconductive layer of YBCO on the first YBCO layer, wherein the first layer of YBCO serves as a template layer to provide a desire relation between c lattice parameters and thickness of the first layer YBCO and the second layer of YBCO, enabling the second superconductive layer of YBCO to be desirably thick thereby providing high critical current density of the superconductive layer, the first template layer having a thickness substantially not exceeding 50 nm and having the c lattice parameter of at least 1.175 nm being therefore non-superconductive at temperature above at least 77K, and the second superconductive layer of YBCO having a the thickness of at least 300 nm and having the c lattice parameter of between 1.1169 and 1.171 nm.